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X-WR-CALNAME:CASSA
X-ORIGINAL-URL:https://cassa.site
X-WR-CALDESC:Events for CASSA
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TZID:UTC
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TZOFFSETFROM:+0000
TZOFFSETTO:+0000
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DTSTART:20240101T000000
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TZID:Asia/Dhaka
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DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20260113T130000
DTEND;TZID=UTC:20260113T140000
DTSTAMP:20260514T205659
CREATED:20260106T121507Z
LAST-MODIFIED:20260106T121507Z
UID:7482-1768309200-1768312800@cassa.site
SUMMARY:Journal Talk 12: Hossain et al. (2025)
DESCRIPTION:Detection of Exoplanets with Machine Learning Techniques Through Transit Light-curve Analysis. \nLink: https://doi.org/10.3847/1538-3881/ae1ba3 \nPresenter: Md. Sadman. \n— \nBoth in person and online. \nTo get notifications and the Google Meet link\, subscribe using the Google Form: \nhttps://docs.google.com/forms/d/e/1FAIpQLSdDUg2eNHuB_z8-nfLU09lLaOmXYVwYC1O59e6hZVU_e07sbA/viewform?usp=header
URL:https://cassa.site/event/jtalk-10-2-2/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260106T130000
DTEND;TZID=UTC:20260106T140000
DTSTAMP:20260514T205659
CREATED:20260105T095700Z
LAST-MODIFIED:20260106T121832Z
UID:7440-1767704400-1767708000@cassa.site
SUMMARY:Journal Talk 11: Giacintucci et al. (2024)
DESCRIPTION:Are Radio Minihalos Confined by Cold Fronts in Galaxy Clusters? Minihalos and Large-scale Sloshing in A3444 and MS 1455.0+2232 \nLink: https://doi.org/10.3847/1538-4357/ad12bc \nPresenter: Ashratul Zannati Purnota. \n— \nBoth in person and online. \nTo get notifications and the Google Meet link\, subscribe using the Google Form: \nhttps://docs.google.com/forms/d/e/1FAIpQLSdDUg2eNHuB_z8-nfLU09lLaOmXYVwYC1O59e6hZVU_e07sbA/viewform?usp=header
URL:https://cassa.site/event/jtalk-10-2/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251223T130000
DTEND;TZID=UTC:20251223T133000
DTSTAMP:20260514T205659
CREATED:20251221T162855Z
LAST-MODIFIED:20251223T074113Z
UID:7173-1766494800-1766496600@cassa.site
SUMMARY:Journal Talk 10: Tudorache et al. 2005
DESCRIPTION:A 15 Mpc rotating galaxy filament at redshift z = 0.032 \nLink:  https://doi.org/10.1093/mnras/staf2005 \nPresenter: Radit Raian\, Adamjee Cantonment College . \n— \nBoth in person and online. \nTo get notifications and the Google Meet link\, subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-10/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251218T143000
DTEND;TZID=UTC:20251218T160000
DTSTAMP:20260514T205659
CREATED:20251206T080700Z
LAST-MODIFIED:20251217T081001Z
UID:6952-1766068200-1766073600@cassa.site
SUMMARY:CASSA Colloquium 12: Between Stars and Planets
DESCRIPTION:Title: Between Stars and Planets: Unveiling the Hidden World of Transiting Brown Dwarfs \nSpeaker: Md Redyan Ahmed\, PhD candidate\, Sydney Institute for Astronomy (SIfA)\, University of Sydney\, Australia. \nAbstract: Transiting brown dwarfs occupy the mass range between stars and planets\, placing them in a unique regime where the physics of both worlds begin to overlap. Wide-field surveys have identified more than 1\,000 isolated brown dwarfs in the Solar neighbourhood\, yet only about 50 systems are known to transit their host stars. With the arrival of the TESS mission\, this picture has begun to change: the sample of transiting brown dwarfs is growing steadily\, providing more systems with precisely measured masses and radii and opening new opportunities to study how these objects form and evolve. In this talk\, I will give a short introduction to transiting brown dwarfs\, how they are detected\, and how their known population has been expanding over time. I will then present TOI-2155 b\, a newly characterised transiting brown dwarf lying right at the hydrogen-burning mass limit. With a mass of 81 $M_J$ (Jupiter mass)\, it contributes an important new data point to the growing population of transiting brown dwarfs and helps us probe the structure\, cooling\, and formation pathways of objects near the low-mass star boundary.
URL:https://cassa.site/event/colloquium-12/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/redyan.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251209T130000
DTEND;TZID=UTC:20251209T133000
DTSTAMP:20260514T205659
CREATED:20251202T083049Z
LAST-MODIFIED:20251209T045658Z
UID:6960-1765285200-1765287000@cassa.site
SUMMARY:Journal Talk 9: Shah et al. 2025
DESCRIPTION:Beyond the clouds: advanced data analysis of a Dutch sky quality meter network \nLink:  https://doi.org/10.1093/mnras/staf1200 \nPresenter: Farzana Akter Lima\, Physics\, Govt. Bangla College. \n— \nBoth in person and online. \nTo get notifications and the Google Meet link\, subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-9/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Dhaka:20251204T180000
DTEND;TZID=Asia/Dhaka:20251204T203000
DTSTAMP:20260514T205659
CREATED:20251204T083206Z
LAST-MODIFIED:20251204T084901Z
UID:6969-1764871200-1764880200@cassa.site
SUMMARY:Astronomy Night 12: Spielberg’s E.T. and the Full Moon
DESCRIPTION:On the night of the last full moon of 2025\, join us for a special screening of E.T. the Extra-Terrestrial (1982)\, directed by Steven Spielberg. Before the screening\, an astronomer will offer a short introduction on the film’s enduring significance in the age of exoplanets. In the early 1980s\, astronomers worldwide were searching the Milky Way for planets around other stars\, but no confirmed exoplanet would be discovered until 1992\, a full decade after E.T.. With more than 7\,000 exoplanets known today\, we can now revisit E.T. in the gentle light of the full moon\, with a renewed sense of wonder and context. \nAfter the 15-minute introduction\, the screening will begin at 6:15 PM inside the CASSA Office. At the same time\, just outside the office\, you will also be able to observe the full moon through CASSA’s telescopes\, as well as with the naked eye.
URL:https://cassa.site/event/an12/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Astronomy Night
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/12/cassa-scaled.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251202T130000
DTEND;TZID=UTC:20251202T133000
DTSTAMP:20260514T205659
CREATED:20251127T082500Z
LAST-MODIFIED:20251202T073222Z
UID:6819-1764680400-1764682200@cassa.site
SUMMARY:Journal Talk 8: Lin et al. 2025
DESCRIPTION:MAPPING THE NEAREST ANCIENT SLOSHING COLD FRONT IN THE SKY WITH XMM-Newton \nLink:  https://doi.org/10.33232/001c.145187 \nPresenter: Tasnim Mahfuz Nafis\, Software Engineering\, Dhaka University. \n— \nBoth in person and online. \nTo get notifications and the Google Meet link subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-8/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251201T113000
DTEND;TZID=UTC:20251201T130000
DTSTAMP:20260514T205659
CREATED:20251127T074540Z
LAST-MODIFIED:20251127T081702Z
UID:6803-1764588600-1764594000@cassa.site
SUMMARY:CASSA Colloquium 11: Catching a star: How modern astronomers find exciting phenomena
DESCRIPTION:Speaker (in person at IUB): Tonima Tasnim Ananna\, PhD\, Assistant Professor\, Department of Physics and Astronomy\, Wayne State University\, USA \nTitle: Catching a star: How modern astronomers find exciting phenomena \nAbstract: Modern astrophysics infers extreme phenomena from precise\, theory-driven signatures. In this talk\, we will explore the empirical case for the Big Bang—cosmic expansion\, light-element abundances\, and the cosmic microwave background—and why these lines of evidence make it the most plausible origin of the Universe. We will examine how kilometer-scale laser interferometers identify black hole mergers with LIGO\, and how next-generation detectors may let us peek closer to the Big Bang via gravitational waves. Finally\, we will explore how JWST pushes galaxy surveys into the first few hundred million years after the Big Bang.
URL:https://cassa.site/event/colloquium-11/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/04/ananna.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251128T180000
DTEND;TZID=UTC:20251128T200000
DTSTAMP:20260514T205659
CREATED:20251120T074513Z
LAST-MODIFIED:20251125T105441Z
UID:6579-1764352800-1764360000@cassa.site
SUMMARY:Astronomy Night 11: Live demonstration of Bangladesh's first array radio telescope
DESCRIPTION:From November 17 to 21\, in CASSA’s second workshop\, 30 students from 10 universities in Bangladesh participated in building\, for the first time in the country\, a Transient Array Radio Telescope (TART). The workshop instructor was Dr. Tim Molteno from the University of Otago in New Zealand\, the lead designer of TART. After seven countries in the Southern Hemisphere\, this is the first time a TART has been installed in the Northern Hemisphere. \nAt this Astronomy Night\, live images from the Small TART (START)\, installed beside the CASSA Office on the IUB rooftop\, will be shown at 6 PM\, when the workshop students will share their experience of working with this radio telescope. After 7 PM\, image-taking of nebulae and star clusters in the Dhaka sky will be demonstrated with CASSA’s small optical telescope Ashvin-1. Additionally\, an 80-millimeter refracting telescope equipped with an eyepiece will allow viewers to observe some objects of the solar system. \n \nLIVE Data of START\, IUB: https://tart.elec.ac.nz/viewer/bd-iub \nStudents from 10 universities participated in CASSA Workshop 2 from 17 – 21 Nov 2025. \nDr. Tim Molteno demonstrating TART imaging during CASSA Workshop 2. \nStudents are learning to measure distances between pairs of antennas in order to perform an array calibration.
URL:https://cassa.site/event/cw2-closing-an/
LOCATION:Independent University\, Bangladesh\, 16 Aftabuddin Ahmed Road\, Bashundhara RA\, 1229\, Bangladesh
CATEGORIES:Ceremony,Outreach
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/11/tart-bd-iub.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251125T130000
DTEND;TZID=UTC:20251125T140000
DTSTAMP:20260514T205659
CREATED:20251111T074619Z
LAST-MODIFIED:20251124T153932Z
UID:6290-1764075600-1764079200@cassa.site
SUMMARY:Journal Talk 7: Mowla et al. 2022
DESCRIPTION:The Sparkler: Evolved High-redshift Globular Cluster Candidates Captured by JWST \nLink:  https://doi.org/10.3847/2041-8213/ac90ca \nPresenter: Most. Atia Sanjida\, MSc student\, Physics\, University of Dhaka \n— \nBoth in person and online. \nTo get notifications and the Google Meet link subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-7/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251120T180000
DTEND;TZID=UTC:20251120T193000
DTSTAMP:20260514T205659
CREATED:20251120T134604Z
LAST-MODIFIED:20251126T061318Z
UID:6122-1763661600-1763667000@cassa.site
SUMMARY:CASSA Colloquium 10: Probing galaxy evolution using massive early-type galaxies at intermediate redshift
DESCRIPTION:Speaker (online): Pritom Mozumdar\, Postdoctoral Researcher\, Department of Physics and Astronomy\, University of California\, Los Angeles\, USA. \nTitle: Probing galaxy evolution using massive early-type galaxies at intermediate redshift \nAbstract: Over the past 8 billion years (since redshift\, z ~ 1)\, the Universe – and the galaxies within it – have changed dramatically. Cosmological simulations suggest that massive early-type galaxies (ETGs)\, which are large\, old systems mostly made of stars\, have slowly transformed in their internal structure during this time. However\, observational evidence of these transformations at intermediate redshift ( z ~ 0.5) isn’t conclusive and sometimes even seems to disagree with what simulations predict. One major reason is the lack of statistically large sample of ETGs with high-quality data at intermediate redshifts. To fill this gap\, I assembled a sample of around 200 massive ETGs at 0.25 < z < 0.75. With this dataset\, I addressed two big questions – 1) Have the stars in these galaxies become more randomly moving\, that is\, have their motions become less ordered\, over cosmic time? 2) Has the overall distribution of mass\, including both stars and dark matter\, changed as the Universe aged? By comparing these galaxies to similar ones in today’s Universe (z ~ 0)\, I found evidence that both the stellar motions and the mass distributions have evolved – offering new clues about how massive galaxies grew and changed over cosmic history.
URL:https://cassa.site/event/colloquium-10/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/10/mozumdar.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251117T094000
DTEND;TZID=UTC:20251117T111500
DTSTAMP:20260514T205659
CREATED:20251112T025313Z
LAST-MODIFIED:20251112T054632Z
UID:6306-1763372400-1763378100@cassa.site
SUMMARY:Opening Ceremony of CASSA Workshop 2
DESCRIPTION:
URL:https://cassa.site/event/workshop-2-opening/
LOCATION:Lecture Gallery MK9006\, DMK Building\, IUB\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Ceremony
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/11/workshop-2-banner-scaled.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251117
DTEND;VALUE=DATE:20251122
DTSTAMP:20260514T205659
CREATED:20250626T104548Z
LAST-MODIFIED:20251021T153707Z
UID:5723-1763337600-1763769599@cassa.site
SUMMARY:CASSA Workshop 2: Installing a Radio Telescope to Image the Invisible
DESCRIPTION:
URL:https://cassa.site/event/workshop-2/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Workshop
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/eor.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251113T180000
DTEND;TZID=UTC:20251113T190000
DTSTAMP:20260514T205659
CREATED:20251113T150529Z
LAST-MODIFIED:20251126T061455Z
UID:5906-1763056800-1763060400@cassa.site
SUMMARY:CASSA Colloquium 9: Photometric Redshifts for Next-Generation Sky Surveys
DESCRIPTION:Speaker (online): Biprateep Dey\, PhD\, Postdoctoral Fellow\, Department of Statistical Sciences\, University of Toronto\, Canada. \nTitle: Photometric Redshifts for Next-Generation Sky Surveys \nAbstract: Knowing the distances to galaxies as measured by their cosmological redshift is crucial for studies of cosmology\, galaxy evolution\, and astronomical transients. The next generation of astronomical imaging surveys (like LSST\, Euclid\, and Roman Observatories) will all be critically dependent on estimates of galaxy redshifts from imaging data alone; the resulting measurements are called photometric redshifts or photo-z’s. Traditional photo-z estimation methods only use measures of total light received from a galaxy (colors and magnitudes) as inputs\, thereby\, throwing away the rich pixel-level information present in images. Moreover\, the uncertainty estimates produced by these methods are not statistically well defined and the availability of data to train these methods is scarce. I will present my work on developing new deep learning-based photo-z estimation methods that take images directly as inputs and provide state-of-the-art photo-z prediction accuracy while being interpretable and requiring less training data. I will also talk about a statistical formalism that I developed to produce well-calibrated photo-z uncertainty estimates that are method-agnostic and employ minimal assumptions. Finally\, I will also provide an overview of our recent efforts to obtain spectroscopic samples to train for photo-z algorithms using the Dark Energy Spectroscopic Instrument (DESI).
URL:https://cassa.site/event/colloquium-9/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/10/dey.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250722T120000
DTEND;TZID=UTC:20250722T130000
DTSTAMP:20260514T205659
CREATED:20250715T065525Z
LAST-MODIFIED:20250715T065537Z
UID:5771-1753185600-1753189200@cassa.site
SUMMARY:Journal Talk 6: Brackenhoff et al. 2025
DESCRIPTION:Robust direction-dependent gain-calibration of beam-modelling errors far from the target field \nLink: https://arxiv.org/abs/2504.02483 \nPresenter: Jannatul Feardous Nishi\, postbac from RUET. \nBoth in person and online. \nTo get notifications and the Google Meet link subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-6/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250717T100000
DTEND;TZID=UTC:20250717T113000
DTSTAMP:20260514T205659
CREATED:20250717T065536Z
LAST-MODIFIED:20251126T061432Z
UID:5729-1752746400-1752751800@cassa.site
SUMMARY:CASSA Colloquium 8: Environmental variations of the low-mass IMF
DESCRIPTION:Speaker (online): Tabassum Shahriar Tanvir\, Postdoc Research Associate\, Department of Physics and Astronomy\, Iowa State University\, USA. \nTitle: Environmental variations of the low-mass IMF \nAbstract: The stellar initial mass function is arguably the most important distribution in astrophysics since it is at least partly determining everything from chemical evolution to the strength of stellar feedback during galaxy formation. While the IMF seems to be nearly universal in nearby\, Milky Way-like galaxies\, in recent years tentative evidence has emerged that the IMF varies slightly in the most extreme star-forming environments (e.g.: early-type galaxies). In a series of magnetohydrodynamic simulations including radiative and protostellar outflow feedback\, we study the environmental variation of the initial mass function. The simulations represent a carefully controlled experiment whereby we keep all dimensionless parameters of the flow constant except for feedback-related ones. We show that radiation feedback suppresses the formation of lower-mass objects more effectively as the surface density increases\, while protostellar outflows grow more effective at suppressing the formation of massive stars. The combined effect of these two trends is towards an IMF with a lower characteristic mass and a narrower overall mass range in high surface density environments. We further explore the effects of varying the metallicity\, and thus the dust properties\, of the star-forming gas. Dust matters because it is the crucial component of the gas that couples it to stellar radiation fields. We show that over a range in metallicity from 1% of Solar to 3x Solar\, corresponding to the lowest metallicity dwarf galaxies in the local universe to the most metal-rich early-types\, metallicity variations are much less important than variations in surface density in driving changes in the IMF. We therefore conclude that the higher surface densities and pressure found in early-type galaxies are most likely responsible for their anomalous IMFs\, while metallicity effects are negligible in comparison.
URL:https://cassa.site/event/colloquium-8/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/jpeg:https://cassa.site/wp-content/uploads/2025/06/tanvir-e1762452831598.jpeg
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250715T120000
DTEND;TZID=UTC:20250715T130000
DTSTAMP:20260514T205659
CREATED:20250714T063106Z
LAST-MODIFIED:20250714T072258Z
UID:5758-1752580800-1752584400@cassa.site
SUMMARY:Journal Talk 5: Wilensky et al. 2025
DESCRIPTION:High Dimensional Beam Inference II: Inference of a Perturbed HERA Beam from Simulated Visibility Data \nLink: https://arxiv.org/abs/2506.20712 \nPresenter: Afnan Uzzaman\, IUB EEE \nBoth in person and online. \nTo get notifications and the Google Meet link subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-5/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250708T120000
DTEND;TZID=UTC:20250708T133000
DTSTAMP:20260514T205659
CREATED:20250629T065803Z
LAST-MODIFIED:20250629T065803Z
UID:5732-1751976000-1751981400@cassa.site
SUMMARY:Journal Talk 4: Shajib et al. 2025
DESCRIPTION:dolphin: A fully automated forward modeling pipeline powered by artificial intelligence for galaxy-scale strong lenses \nLink: https://doi.org/10.48550/arXiv.2503.22657 \nPresenter: Nafis Sadik Nihal \nBoth in person and online. \nTo get notifications and the Google Meet link subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-4/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250701T120000
DTEND;TZID=UTC:20250701T133000
DTSTAMP:20260514T205659
CREATED:20250619T094254Z
LAST-MODIFIED:20250619T094352Z
UID:5540-1751371200-1751376600@cassa.site
SUMMARY:Journal Talk 3: Wong et al. 2025
DESCRIPTION:Radio Galaxy Zoo data release 1: 100185 radio source classifications from the FIRST and ATLAS surveys  \nLink: https://doi.org/10.1093/mnras/stae2790 \nPresenter: Md Shahadat Hossain Shahal \nRelated other papers: \n\nRadio galaxy zoo: towards building the first multipurpose foundation model for radio astronomy with self-supervised learning\nIdentification of 4876 Bent-tail Radio Galaxies in the FIRST Survey Using Deep Learning Combined with Visual Inspection\n\nBoth in person and online. \nTo get notifications and the Google Meet link subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-3/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250626T120000
DTEND;TZID=UTC:20250626T140000
DTSTAMP:20260514T205659
CREATED:20250626T095039Z
LAST-MODIFIED:20251126T061415Z
UID:5477-1750939200-1750946400@cassa.site
SUMMARY:CASSA Colloquium 7: Strong Gravitational Lensing as a Probe of Cosmology
DESCRIPTION:Speaker (online): Kenneth C. Wong\, PhD\, Assistant Professor\, Research Center for the Early Universe (RESCEU)\, University of Tokyo\, Japan. \nAbstract: Strong gravitational lensing is sensitive to the total mass distribution along the line of sight\, making it a unique probe of dark matter in galaxies and clusters\, and useful for studying resolved properties of the magnified background sources. Strong lensing is also valuable for constraining cosmology through lensed quasars\, which can be monitored to measure the “time delay” between the multiple images and constrain the Hubble constant ($H_0$). This method of measuring $H_0$ is independent of type Ia supernovae and CMB observations\, and may shed light on the $H_0$ tension between local universe and CMB measurements. The latest results from the TDCOSMO project constrains $H_0$ to be $\sim 72$ km/s/Mpc in a flat Lambda CDM cosmology with a precision of $\sim 5\%$. This result is maximally conservative with respect to galaxy mass profiles\, and is consistent with independent determinations of $H_0$ using type Ia supernovae calibrated by the distance ladder method. To improve this measurement\, as well as leverage the power of strong lensing to study galaxy structure and magnified background sources\, we require deep wide-area imaging surveys to build up a statistical sample of lenses\, which in general are rare objects. The Hyper-Suprime Cam SSP is an optical survey using the Subaru Telescope that covers $>1000$ deg$^2$ of the sky to a depth of $r\sim 26$. The HSC SSP strong lensing working group is focused on searching for new lenses of all types and scales and using these systems for studies of galaxy structure and cosmology. We have developed a variety of lens search methods\, including recent machine learning techniques that can be applied to future datasets such as LSST and Euclid. \n\n\nTDCOSMO 2025 milestone paper: https://arxiv.org/abs/2506.03023 \n\n\nPapers relevant for the second part of the talk:\n\nhttps://ui.adsabs.harvard.edu/abs/2018PASJ…70S..29S/\nhttps://ui.adsabs.harvard.edu/abs/2018ApJ…867..107W/\nhttps://ui.adsabs.harvard.edu/abs/2020A%26A…636A..87C/\nhttps://ui.adsabs.harvard.edu/abs/2024MNRAS.535.1625J/
URL:https://cassa.site/event/colloquium-7/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cassa.site/wp-content/uploads/2025/06/kcw.png
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250624T120000
DTEND;TZID=UTC:20250624T133000
DTSTAMP:20260514T205659
CREATED:20250619T090435Z
LAST-MODIFIED:20250619T092440Z
UID:5531-1750766400-1750771800@cassa.site
SUMMARY:Journal Talk 2: van Zyl & Grobler 2024
DESCRIPTION:Remove First Detect Later: a counter-intuitive approach for detecting radio frequency interference in radio sky imagery  \nLink: https://doi.org/10.1093/mnras/stae979 \nPresenter: Adrita Khan \nBoth in person and online. \nTo get notifications and the Google Meet link subscribe using the Google Form: \nhttps://forms.gle/fikhmc7Y2whjJWKK9
URL:https://cassa.site/event/jtalk-2/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/06/journal-talk.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250623T203000
DTEND;TZID=UTC:20250623T223000
DTSTAMP:20260514T205659
CREATED:20250615T074740Z
LAST-MODIFIED:20250623T124815Z
UID:5428-1750710600-1750717800@cassa.site
SUMMARY:Rubin First Look Watch Party
DESCRIPTION:🌌 You’re Invited: Rubin First Look Watch Party at CASSA! 🌌 \nJoin us at CASSA\, IUB\, for a truly historic moment in astronomy! 🚀 \n📅 Date: Monday\, 23 June 2025\n🕚 Time: 8:00 PM BST (Live stream starts at 8:30 PM)\n📍 Venue: CASSA\, Independent University\, Bangladesh \nWe are thrilled to host a local Watch Party for the Rubin First Look — the global unveiling of the very first images from the Vera C. Rubin Observatory! 🌠 This marks the dawn of a new era in astronomy\, and you can witness it live with the global science community. \n🔭 What’s happening: \n\n\n\n\n\n\n08:00\nGuests arrive at CASSA office and Dr. Asad introduces the program\n\n\n08:15\n“Bringing the Night Sky to Life” — an interactive (with Q&A) introduction (with slides) to the Rubin observatory\n\n\n08:45\nA demonstration of the small telescopes of Durbin at CASSA office\n\n\n09:00\nRubin First Look Unveiling Event livestream begins\n\n\n10:30\nQ&A about the livestream and about the future of Rubin\n\n\n\nAll are welcome — students\, astronomy enthusiasts\, faculty\, and the curious alike! \n📡 Live stream in English (Spanish version also available) \nDon’t miss your chance to be part of this celestial milestone!\nFollow this page for updates. 🌌
URL:https://cassa.site/event/rubin-first-look-watch-party/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Outreach
ATTACH;FMTTYPE=image/jpeg:https://cassa.site/wp-content/uploads/2025/06/rubin.jpg
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250617T120000
DTEND;TZID=UTC:20250617T133000
DTSTAMP:20260514T205659
CREATED:20250617T093500Z
LAST-MODIFIED:20250617T114522Z
UID:5468-1750161600-1750167000@cassa.site
SUMMARY:Journal Talk 1: Garon et al. 2019
DESCRIPTION:Radio Galaxy Zoo: The Distortion of Radio Galaxies by Galaxy Clusters \nhttps://doi.org/10.3847/1538-3881/aaff62 \nPresenter: Mir Sazzat Hossain
URL:https://cassa.site/event/jtalk-1/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Journal Talk
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250502T090000
DTEND;TZID=UTC:20250503T170000
DTSTAMP:20260514T205659
CREATED:20250322T071351Z
LAST-MODIFIED:20250514T155006Z
UID:4929-1746176400-1746291600@cassa.site
SUMMARY:CASSA Workshop 1: Unclouding the Thousand Eyes of an Array Radio Telescope
DESCRIPTION:The most advanced telescopes at radio wavelengths are now Array Radio Telescopes (ART)\, arrays of hundreds and thousands of radio antennas guarding the universe like Argus in Ovid’s Metamorphoses. ARTs are everywhere\, from the Y-shaped Very Large Array (VLA) in the deserts of New Mexico to the rectilinear Medicina displayed dramatically in the Red Desert (1964) of Michelangelo Antonioni (pictured in the poster). \nIn this 2-day workshop for undergraduate\, postbac and graduate students of Bangladesh\, we will learn the basics of radio astronomy and synthesis arrays on the first day\, and then apply that knowledge to make a sparse representation of the radio vision of an ART in python. It is a BYOL workshop\, so you have to ‘bring your own laptop’ with python and jupyter-lab set up in a UNIX-based operating system (Ubuntu is an excellent choice). Eligibility criteria\, registration link\, and the program are given below. \n\n  \nEligibility\n\nYou have to be an undergraduate\, postbac (finished BSc but did not start any other academic program yet)\, or graduate student currently living in Bangladesh.\nYou have to be able to join the workshop in person at IUB from 9 am – 5 pm on 18 and 19 April\, 2025. Online option is not available for this specific workshop\, but in future CASSA will have both in person\, online and hybrid workshops.\nThe subject of your undergraduate or graduate studies have to be a math-intensive engineering\, mathematical or natural science\, or computer science.\nYou should have some basic knowledge of python;. Being an expert in python is not necessary\, because the students will be divided in groups for groupworks (GW) and we will ensure that each group has a variety of students with different levels of expertise in python.\nYou must bring (and work on) your own laptop (BYOL) and the laptop should have a UNIX-like terminal and jupyter-lab with which you can log into a high-performance computing server. If you are not sure about the setup in the terminal and jupyter-lab\, we will help you during the workshop.\nNo prior knowledge of astronomy is required\, but previous experience in learning or researching astronomy will be considered for the final selection of participants.\nWe encourage you to browse through the online textbook Essential Radio Astronomy before appearing for the workshop\, but you will not be tested on it.\n\nRegistration\n\n\nIf you are eligible (based on the previous section)\, please click here for the Google Form for registration (or the button above).\nRegistration deadline: 18 April\, 2025.\nWe specially encourage women to apply without any hesitation. At least 40% of seats will be reserved for women applicants.\n\nProgram Schedule\nThe following is the tentative schedule\, which may be subject to minor changes until 30 April. [GW: groupwork] \n\n\n\n\n\n\n\n\n\nDay\nFrom\nTo\nSegment\nInstructor\n\n\n\n2\nMay\n2025\nFri\n\n9:00\n10:00\nIcebreaker\n\n\n\n10:00\n11:00\nIntroduction to radio astronomy\nKMB Asad\n\n\n11:00\n11:30\nCoffee break\n\n\n\n11:30\n12:30\nArray Radio Telescopes (ART)\nAsad\n\n\n12:30\n02:00\nLunch break 1\n\n\n\n02:00\n03:00\nPrimary beams of ART antennas\nAsad\n\n\n03:00\n03:30\nGroup creation\n\n\n\n03:30\n05:00\nGW: Setting up the group projects\nCASSA TAs\n\n\n07:00\n09:00\nOptional stargazing at night\nDurbin\n\n\n\n3\nMay\n2025\nSat\n\n9:00\n10:00\nSparse representation of beams\nAsad\n\n\n10:00\n11:00\nGW: decomposing LOFAR beams\nAsad\n\n\n11:00\n11:30\nCoffee break\n\n\n\n11:30\n12:30\nGW: reconstructing LOFAR beams\nCASSA TAs\n\n\n12:30\n02:00\nLunch break\n\n\n\n02:00\n03:00\nGW: finalizing LOFAR beams\nCASSA TAs\n\n\n03:00\n03:30\nSubmission of the GWs\n\n\n\n03:30\n05:00\nGW presentations\nAsad\n\n\n\nTeaching Assistants\n\nAfnan Uzzaman\, BSc student\, electrical and electronic engineering\, IUB.\nMd. Shahadat Hossain Shahal\, BSc student\, computer science and engineering\, IUB.\nMozammal Hossain Masum\, BSc student\, computer science and engineering\, IUB.\n\nList of Participants\n\n\n\n\n\n\n\nName\nUniversity\nGroup\n\n\n\n\nAbantika Maytra Oishee\nHajee Mohammad Danesh Science and Technology University\n1\n\n\nAbyaz Karim\nIndependent University\, Bangladesh\n1\n\n\nMD. MERAJUL HASAN\nUniversity of Dhaka\n1\n\n\nMost. Atia Sanjida\nUniversity of Dhaka\n1\n\n\nSarker Mahathir Mohammad\nUniversity of Dhaka\n1\n\n\nMd. Soyed Ahmed\nAhsanullah University of Science and Technology\n2\n\n\nBrishti Dhar\nIndependent University\, Bangladesh\n2\n\n\nShams Habib Muzaffar\nIndependent University\, Bangladesh\n2\n\n\nAhmad Al-Imtiaz\nShahjalal University of Science and Technology\n2\n\n\nTabib Zahin\nUniversity of Dhaka\n2\n\n\nHaniah Mokhtar\nBRAC University\n3\n\n\nTasfia Hasan Faiza\nIndependent University\, Bangladesh\n3\n\n\nNublat Hafsa\nIndependent University\, Bangladesh\n3\n\n\nFahima Khal Shayeq\nAsian University for Women\n4\n\n\nAiman Rafeed Bin Ehtesham\nMilitary Institute of Science and Technology\n4\n\n\nMuhammad Arif Hussain\nUniversity of Dhaka\n4\n\n\nTasnim Mahfuz Nafis\nUniversity of Dhaka\n4\n\n\nUrboshi Barua\nAsian University for Women\n5\n\n\nTazrian Noor\nIndependent University\, Bangladesh\n5\n\n\nDeba Priyo Guha\nRajshahi University of Engineering and Technology\n5\n\n\nM.O.B. JIHAD\nAmerican International University-Bangladesh\n6\n\n\nHameeda Ahmadi\nAsian University for Women\n6\n\n\nRownok Shahariar\nGovt. Edward College\, Pabna\n6\n\n\nMd. Abu Azad Tamim\nUniversity of Chittagong\n6\n\n\nMasuk Ridwan Saumo\nBangladesh University of Engineering and Technology\n7\n\n\nMD. SHAYED HASAN SAHKIB\nDaffodil International University\n7\n\n\nMiss Nourin Nurain Amina\nKhulna University\n7\n\n\nHridita Nowrin Pranti\nUniversity of Chittagong\n7\n\n\nSajid Ahmed Chowdhury\nIndependent University\, Bangladesh\n8\n\n\nZakia Nazzum\nIndependent University\, Bangladesh\n8
URL:https://cassa.site/event/workshop-1/
LOCATION:CASSA\, IUB Main Building Rooftop\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA (Main Building Rooftop)\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Workshop
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2024/02/LOFAR_Superterp.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250428
DTEND;VALUE=DATE:20250503
DTSTAMP:20260514T205659
CREATED:20241029T152642Z
LAST-MODIFIED:20241119T200140Z
UID:3469-1745798400-1746230399@cassa.site
SUMMARY:LOFAR-EoR Plenary Meeting
DESCRIPTION:
URL:https://cassa.site/event/lofar-eor-plenary-meeting/
CATEGORIES:Meeting
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2024/05/radtel-1.webp
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250316T214500
DTEND;TZID=UTC:20250316T224500
DTSTAMP:20260514T205659
CREATED:20250308T053043Z
LAST-MODIFIED:20250308T053558Z
UID:4872-1742161500-1742165100@cassa.site
SUMMARY:CASSA Plenary Meeting 1
DESCRIPTION:A meeting among the core and associate members for understanding the past and planning the future of CASSA.
URL:https://cassa.site/event/plenary-meeting-1/
LOCATION:Google Meet
CATEGORIES:Meeting
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/02/cassa.webp
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250213T143000
DTEND;TZID=UTC:20250213T153000
DTSTAMP:20260514T205659
CREATED:20250208T173307Z
LAST-MODIFIED:20250213T072823Z
UID:4755-1739457000-1739460600@cassa.site
SUMMARY:CASSA Tea Talk 1: Revisiting the age scale of Galactic globular clusters
DESCRIPTION:Speaker: S M Masruk Uddin\, M2 Sudent (International Research Track)\, Observatoire de Paris; Research Intern\, Laboratory for Astrophysics Research and Instrumentation (LIRA); Paris Sciences et Lettres University (PSL)\, France. \nAbstract: Globular clusters (GCs) are critical for understanding the formation and evolution of the Milky Way. Their ages provide constraints on Galactic formation models. This study revisits the age scale of Galactic GCs using photometric data from the Hubble Space Telescope and spectroscopic data from the APOGEE survey. The SPInS (Stellar Parameters Inferred Systematically) framework was employed to infer ages through Bayesian analysis with Markov Chain Monte Carlo (MCMC). Initial tests on NGC 5053 refined the methodology but highlighted computational inefficiencies in SPInS\, particularly for large datasets. Despite these challenges\, the analysis produced robust age estimates consistent with the established age of the Milky Way. Anticipated optimizations to SPInS will allow scaling the methodology to all selected clusters\, enabling precise age determinations and enhancing our understanding of Galactic formation history. \nS M Masruk Uddin graduated from IUB with a major in physics and minor in computer science.
URL:https://cassa.site/event/tea-talk-1/
LOCATION:IUB Room BC2022\, Digital Classroom\, IUB\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Tea Talk
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/02/masruk.webp
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250206T130000
DTEND;TZID=UTC:20250206T143000
DTSTAMP:20260514T205659
CREATED:20250206T114409Z
LAST-MODIFIED:20251126T061345Z
UID:4549-1738846800-1738852200@cassa.site
SUMMARY:CASSA Colloquium 6: Unraveling the distant Universe with wide-field surveys of star-forming galaxies
DESCRIPTION:Speaker: Tanveer Karim\, PhD\, Postdoctoral Fellow at the David A. Dunlap Department of Astronomy & Astrophysics\, University of Toronto\, and a member of the Dark Energy Spectroscopic Instrument (DESI) collaboration and the Dark Energy Science Collaboration (DESC). \nAbstract: Over the past decade\, cosmology has encountered significant tensions between different measurements of key cosmological parameters\, particularly when comparing the cosmic microwave background (CMB) with data from large-scale structures. Historically\, large-scale structure observations have primarily focused on the Universe below redshift 1 using galaxies that are 100-1000 times more massive than our Milky Way. However\, ongoing and upcoming surveys\, such as the Dark Energy Spectroscopic Instrument (DESI) and the Rubin Observatory\, are expanding these measurements beyond redshift 1\, opening new avenues for exploration. In this talk\, I will discuss the exciting opportunities and the challenges of probing the Universe at 𝑧 ≥ 1 using wide-field surveys of star-forming and less massive galaxies. I will present recent results from the cross-correlation of DESI Legacy Imaging Surveys’ Emission-Line Galaxies with Planck CMB lensing and contextualize reasons for various apparent tensions. \nGoogle Meet: https://meet.google.com/izz-qwux-pod
URL:https://cassa.site/event/colloquium-6/
LOCATION:Room MK5004\, DMK Building\, IUB\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara Ra\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2025/01/karim-e1740627757393.webp
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250130T140000
DTEND;TZID=UTC:20250130T150000
DTSTAMP:20260514T205659
CREATED:20250130T092631Z
LAST-MODIFIED:20251126T061255Z
UID:3999-1738245600-1738249200@cassa.site
SUMMARY:CASSA Colloquium 5: Lower Dark Matter in the Local Group Galaxies and the Origin of the MW Dwarfs
DESCRIPTION:Speaker:\nIstiak Akib\, PhD candidate\, Laboratoire d’Instrumentation et de Recherche en Astrophysique (LIRA)\, Observatoire de Paris\, Paris Sciences et Lettres University (PSL). \n\nAbstract:\nFitting the flat rotation curves of the Galaxies indicate vast majority of the matter content in the galaxies is dark matter\, even higher than the cosmological estimate of 85% and giving rise to the missing baryon problem. However\, these rotation curve fits assume equilibrium conditions at the disk outskirts. This is not necessarily always fulfilled since on average galaxies have gone through a major merger 6 Gyr ago. For the MW\, the last major merger was 9-10 Gyr ago and the disk outskirts had enough time to reasonably fulfill the equilibrium conditions. Gaia DR3 rotation curve for the MW differs significantly from a flat fit and is consistent with a Keplerian decline. This gives a mass of $2.06\times 10^{11}$ M$_\odot$\, resulting in a dark matter fraction of 70%. Another estimate for the galaxy mass comes from comparing the time frame of the bulge formation and the accretion of the satellites with their binding energies. For the MW\, this is in agreement with the mass from the rotation curve. Andromeda Galaxy (M31) had a recent 2-3 Gyr major merger and hence the disk outskirts are likely not in equilibrium. Hydrodynamical modeling of this merger resulting in an M31 of mass $4.5\times 10^{11}$ M$_\odot$ and 68% dark matter reproduces the observational features of the M31 and especially its rotation curve. These M31 merger models indicate tidal tails coming towards the MW with significant stellar and gas particles. Part of these tails is found in agreement in the 6D space with most of the VPOS (Vast POlar Structure) satellites including the LMC for the case of such low mass MW models. This may explain the origin of the MW’s plane of satellites and is a first indication of matter exchange between these two galaxies. \nRelevant papers:\n\nJiao et al 2023: Detection of the Keplerian decline in the Milky Way rotation curve.\nHammer et al 2024a: The Milky Way accretion history compared to cosmological simulations.\nHammer et al 2024b: Dark matter fraction derived from the M31 rotation curve.\nAkib et al 2025: An intriguing coincidence between the majority of the VPOS dwarfs and a recent major merger at the M31 position (in revision at A&A).\nJiao et al 2025: Dark matter mass range in the Milky Way derived from the rotation curve (in preparation).
URL:https://cassa.site/event/colloquium-5/
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2024/12/akib-1.webp
ORGANIZER;CN="CASSA%2C Independent University%2C Bangladesh":MAILTO:cassa@iub.edu.bd
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250109T130000
DTEND;TZID=UTC:20250109T140000
DTSTAMP:20260514T205659
CREATED:20250109T092216Z
LAST-MODIFIED:20250111T143857Z
UID:3768-1736427600-1736431200@cassa.site
SUMMARY:CASSA Colloquium 4: Astronomy in Space: Pioneering Missions for Lunar and Orbital Observatories
DESCRIPTION:Speaker: Shah Mohammad Bahauddin\, PhD\, Research Faculty\, Laboratory for Atmospheric and Space Physics (LASP)\, Astrophysical & Planetary Sciences Department\, University of Colorado\, Boulder\, USA. \nAbstract: The next frontier of astronomy lies in leveraging the unique environments of space and the Moon to unlock unprecedented scientific discoveries. This presentation will explore the speaker’s journey of transforming scientific questions into mission concepts\, focusing on the development of space and lunar observatories. Drawing on experience with NASA mission concepts\, the talk will emphasize the intersection of scientific motivation\, instrument design\, and mission planning. It will also highlight the transformative potential of innovative technologies\, such as advanced optical designs\, onboard artificial intelligence\, and cutting-edge signal processing techniques\, in enabling new avenues for space astronomy. By harnessing the unique advantages of space-based and lunar observatories\, these missions aim to address fundamental questions about the origins\, dynamics\, and evolution of the universe. \nRelevant article: This May Be the First Complete Observation of a Nanoflare\, NASA.
URL:https://cassa.site/event/colloquium-4/
LOCATION:Lecture Gallery MK9006\, DMK Building\, IUB\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/webp:https://cassa.site/wp-content/uploads/2024/11/bahauddin-e1732621966981.webp
END:VEVENT
END:VCALENDAR