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X-WR-CALDESC:Events for CASSA
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DTSTART:20240101T000000
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DTSTART;TZID=UTC:20250105T130000
DTEND;TZID=UTC:20250105T140000
DTSTAMP:20260517T122052
CREATED:20250105T155404Z
LAST-MODIFIED:20250111T143847Z
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SUMMARY:CASSA Colloquium 3: Measuring the Expansion Rate of the Universe from Carnegie Supernova Project
DESCRIPTION:Speaker: Syed A Uddin\, PhD\, Department of Physics and Astronomy\, University of South Carolina\, USA. \nThe Known Unknowns of Observational Cosmology: Measuring the Expansion Rate of the Universe from Carnegie Supernova Project \nAbstract: In the era of precision cosmology\, where percent-level accuracy in measurements is now within reach\, we are still confronted with profound enigmas: dark matter\, dark energy\, and the Universe’s dark ages. Compounding these challenges is the ongoing discrepancy in Hubble constant values\, known as the Hubble tension\, between measurements from the Cosmic Microwave Background and those based on the Type Ia Supernova distance scale. In this talk\, I will explore key milestones in observational cosmology\, delve into the intricacies of Hubble constant measurements\, and share our latest findings from the Carnegie Supernova Project. \nRelevant paper: Carnegie Supernova Project I and II: Measurements of H0 Using Cepheid\, Tip of the Red Giant Branch\, and Surface Brightness Fluctuation Distance Calibration to Type Ia Supernovae.
URL:https://cassa.site/event/colloquium-3/
LOCATION:Lecture Gallery MK9006\, DMK Building\, IUB\, Plot 16\, Aftabuddin Ahmed Road\, Block B\, Bashundhara RA\, Dhaka\, 1229\, Bangladesh
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/jpeg:https://cassa.site/wp-content/uploads/2024/11/uddin.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20250109T130000
DTEND;TZID=UTC:20250109T140000
DTSTAMP:20260517T122052
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
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BEGIN:VEVENT
DTSTART;TZID=UTC:20250130T140000
DTEND;TZID=UTC:20250130T150000
DTSTAMP:20260517T122052
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
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