A5017826168- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Advanced Vision and Imaging
University of Chicago
2022-2025
Netherlands Institute for Radio Astronomy
2024
Electronics for Imaging (United States)
2024
Abstract We report the discovery and spectroscopic confirmation of an ultra-faint Milky Way satellite in constellation Leo. This system was discovered as a spatial overdensity resolved stars observed with Dark Energy Camera (DECam) data from early version third release DECam Local Volume Exploration (or DELVE) survey. The low luminosity ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mi>V</mml:mi>...
Abstract We present the discovery of Aquarius III, an ultra-faint Milky Way satellite galaxy identified in second data release DECam Local Volume Exploration survey. Based on deeper follow-up imaging with DECam, we find that III is a low-luminosity ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mi>V</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:mo>−</mml:mo> <mml:msubsup> <mml:mn>2.5</mml:mn>...
ABSTRACT The mass distribution in massive elliptical galaxies encodes their evolutionary history, thus providing an avenue to constrain the baryonic astrophysics evolution. power-law assumption for radial profile ellipticals has been sufficient describe several observables noise level, including strong lensing and stellar dynamics. In this paper, we quantitatively constrained any deviation, or lack thereof, from through joint lensing–dynamics analysis of a large statistical sample with 77...
We perform a search for galaxy-galaxy strong lens systems using convolutional neural network (CNN) applied to imaging data from the first public release of DECam Local Volume Exploration Survey (DELVE), which contains $\sim 520$ million astronomical sources covering 4,000$ $\mathrm{deg}^2$ southern sky $5\sigma$ point-source depth $g=24.3$, $r=23.9$, $i=23.3$, and $z=22.8$ mag. Following methodology similar searches data, we apply color magnitude cuts select catalog 11$ extended sources....
Warm dark matter has been strongly constrained in recent years as the sole component of matter. However, a less-explored alternative is that consists mixture warm and cold (MWDM). In this work, we use observations Milky Way satellite galaxies to constrain MWDM scenarios where formation small-scale structure suppressed either by generic thermal relic or sterile neutrino produced through Shi-Fuller mechanism. To achieve this, model combining numerical simulations with semi-analytical models...
We report the discovery and spectroscopic confirmation of an ultra-faint Milky Way (MW) satellite in constellation Leo. This system was discovered as a spatial overdensity resolved stars observed with Dark Energy Camera (DECam) data from early version third release DECam Local Volume Exploration survey (DELVE EDR3). The low luminosity ($M_V = -3.56_{-0.37}^{+0.47}$; $L_V 2300_{-800}^{+1000} L_\odot$), large size ($r_{1/2} 90_{-30}^{+30}$ pc), heliocentric distance ($D 111_{-4}^{+7}$ kpc) are...
We present a new measurement of the dark and luminous matter distribution massive elliptical galaxies, their evolution with redshift, by combining strong lensing dynamical observables. Our sample 58 lens galaxies covers redshift range $0.090\leq z_{\rm l}\leq0.884$. By Hubble Space Telescope imaging previously observed velocity dispersion line-of-sight measurements, we decompose profile from perform Bayesian hierarchical analysis to constrain population-level properties both profiles. find...
We present the discovery of Aquarius III, an ultra-faint Milky Way satellite galaxy identified in second data release DECam Local Volume Exploration (DELVE) survey. Based on deeper follow-up imaging with DECam, we find that III is a low-luminosity ($M_V = -2.5^{+0.3}_{-0.5}$; $L_V 850^{+380}_{-260} \ L_{\odot}$), extended ($r_{1/2} 41^{+9}_{-8}$ pc) stellar system located outer halo ($D_{\odot} 85 \pm 4$ kpc). From medium-resolution Keck/DEIMOS spectroscopy, identify 11 member stars and...
Abstract From various lensing and non-lensing observations, the total density profile in elliptical galaxies is well approximated by a power law mass distribution. However, as neither dark matter nor baryons individually follow law, this observational result has been referred to “bulge–halo conspiracy”. We investigate consistency of conspiracy with higher precision than previous studies largest ever sample galaxy–galaxy lenses assembled from archival Hubble Space Telescope ( HST ) data. By...
The mass distribution in massive elliptical galaxies encodes their evolutionary history, thus providing an avenue to constrain the baryonic astrophysics evolution. power-law assumption for radial profile ellipticals has been sufficient describe several observables noise level, including strong lensing and stellar dynamics. In this paper, we quantitatively constrained any deviation, or lack thereof, from through joint lensing-dynamics analysis of a large statistical sample with 77...