Investigating the relation between environment and internal structure of massive elliptical galaxies using strong lensing

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Abstract: Strong lensing directly probes the internal structure of the lensing galaxies. In this paper, we investigate the relation between the internal structure of massive elliptical galaxies and their environment using a sample of 15 strong…

Analyzing type Ia supernovae near-infrared light curves with Principal Component Analysis

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Abstract: Type Ia supernovae (SNeIa), the thermonuclear explosions of C/O white dwarf stars in binary systems, are phenomena that remain poorly understood. The complexity of their progenitor systems, explosion physics and intrinsic diversity…

dolphin: A fully automated forward modeling pipeline powered by artificial intelligence for galaxy-scale strong lenses

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Abstract: Strong gravitational lensing is a powerful tool for probing the internal structure and evolution of galaxies, the nature of dark matter, and the expansion history of the Universe, among many other scientific applications. For almost…
NASA, ESA, CSA, STScI, Chris Willott (National Research Council Canada), Lamiya Mowla (Wellesley College), Kartheik Iyer (Columbia University)

Formation of a low-mass galaxy from star clusters in a 600-million-year-old Universe

NASA, ESA, CSA, STScI, Chris Willott (National Research Council Canada), Lamiya Mowla (Wellesley College), Kartheik Iyer (Columbia University).

The SARAO MeerKAT 1.3 GHz Galactic Plane Survey

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We present the SARAO MeerKAT Galactic Plane Survey (SMGPS), a 1.3 GHz continuum survey of almost half of the Galactic Plane ($251^\circ \le l \le 358^\circ$ and $2^\circ \le l \le 61^\circ$ at $|b| \le 1.5^\circ$). SMGPS is the…

Morphological classification of Radio Galaxies using Semi-Supervised Group Equivariant CNNs

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Out of the estimated few trillion galaxies, only around a million have been detected through radio frequencies, and only a tiny fraction, approximately a thousand, have been manually classified. We have addressed this disparity between labeled…

Mining mini-halos with MeerKAT I. Calibration and imaging

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Radio mini-halos are clouds of diffuse, low-surface brightness synchrotron emission that surround the Brightest Cluster Galaxy (BCG) in massive cool-core galaxy clusters. In this paper, we use third generation calibration (3GC), also called…

The 1.28 GHz MeerKAT Galactic Center Mosaic

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The inner $\sim 200$ pc region of the Galaxy contains a 4 million $M_\odot$ supermassive black hole (SMBH), significant quantities of molecular gas, and star formation and cosmic-ray energy densities that are roughly two orders of magnitude…

Primary beam effects of radio astronomy antennas – II. Modelling MeerKAT L-band beams

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After a decade of design and construction, South Africa’s SKA-MID precursor MeerKAT has begun its science operations. To make full use of the widefield capability of the array, it is imperative that we have an accurate model of the primary…

Constraining the intergalactic medium at z ≈ 9.1 using LOFAR Epoch of Reionization observations

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We derive constraints on the thermal and ionization states of the intergalactic medium (IGM) at redshift $\approx 9.1$ using new upper limits on the 21-cm power spectrum measured by the LOFAR radio telescope and a prior on the ionized fraction…