A5033119247- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Space Exploration and Technology
- Granular flow and fluidized beds
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Geotechnical Engineering and Soil Mechanics
- Geotechnical and Geomechanical Engineering
- Spacecraft Design and Technology
- Computational Physics and Python Applications
University of California, San Diego
2024-2025
University of California, Irvine
2021-2023
Georgia Institute of Technology
2020
Abstract Many quiescent galaxies discovered in the early Universe by JWST raise fundamental questions on when and how these became stayed quenched. Making use of latest version semianalytic model GAEA that provides good agreement with observed quenched fractions up to z ∼ 3, we make predictions for expected 7 analyze main quenching mechanism. We find a simulated box 685 Mpc side, first massive ( M ⋆ 10 11 ⊙ ), Milky Way–mass, low-mass 9.5 ) appear at 4.5, 6.2, before = 7, respectively. Most...
Abstract We present results from a Keck/DEIMOS survey to study satellite quenching in group environments at z ~ 0.8 within the Extended Groth Strip (EGS). target 11 groups EGS with extended X-ray emission. obtain high-quality spectroscopic redshifts for member candidates, extending depths over 1 order of magnitude fainter than existing DEEP2/DEEP3 spectroscopy. This depth enables first measurement quiescent fraction down stellar masses ~10 9.5 M ⊙ this redshift. By combining an infall-based...
We report the discovery of post-starburst ultra-diffuse galaxies (UDGs), identified through spectroscopic analysis with KCWI at Keck II Telescope. Our is based on a sample 44 candidate UDGs selected from Systematically Measuring Ultra-Diffuse Galaxies (SMUDGes) program. measured redshifts reveal $\sim 80\%$ entire exhibit large physical sizes ($R_{e} \gtrsim 1~{\rm kpc}$) and low surface brightnesses ($24 \lesssim \mu_{0,g} 25$ mag arcsec$^{-2}$) which categorize them as UDGs. find $20\%$...
Abstract Understanding the processes that transform star-forming galaxies into quiescent ones is key to unraveling role of environment in galaxy evolution. We present measurements luminosity functions (LFs) and stellar mass (SMFs) passive red-sequence four clusters at 0.8 < z 1.3, selected using deep VLT observations complemented with data from GCLASS GOGREEN surveys. find a significant enhancement abundance faint/low-mass both LFs SMFs all compared field. This further evidenced by...
When grains are added to a cylinder, the weight at bottom is smaller than total of column, which partially supported by lateral walls through wall/grain frictional forces. This known as Janssen effect. Via combined experimental and numerical investigation, here we demonstrate reverse Jansen effect whereby fraction base overcomes one. We characterize dependence this phenomenon on various control parameters involved, rationalize physical process responsible for emergence compressional forces...
ABSTRACT We explore models of massive (>1010 M⊙) satellite quenching in clusters at z ≳ 1 using an MCMC framework, focusing on two primary parameters: Rquench (the host-centric radius which begins) and τquench time-scale upon a quenches after crossing Rquench). Our analysis shows local maxima the 1D posterior probability distribution approximately 0.25 1.0 R200. Analysing four distinct solutions τquench–Rquench parameter space, nearly all yield quiescent fractions consistent with...
As the Milky Way and its satellite system become more entrenched in near field cosmology efforts, need for an accurate mass estimate of Way's dark matter halo is increasingly critical. With second early third data releases stellar proper motions from {\it Gaia}, several groups calculated full $6$D phase-space information population galaxies. Utilizing these comparison to subhalo properties drawn Phat ELVIS simulations, we constrain be $\sim 1-1.2\times10^{12}~\msun$. We find that kinematics...
Recent observations have shown that the environmental quenching of galaxies at z ~ 1 is qualitatively different to in local Universe. However, physical origin these differences has not yet been elucidated. In addition, while low-redshift comparisons between observed trends and predictions cosmological hydrodynamical simulations are now routine, there relatively few higher redshifts date. Here we confront three state-of-the-art suites (BAHAMAS+MACSIS, EAGLE+Hydrangea, IllustrisTNG) with field...
Many quenched galaxies discovered in the early Universe by \textit{JWST} raise fundemental question s on when and how these became quiescent. Making use of latest version semi-analytic model GAEA that provides good agreement with observed fractions up to $z\sim 3$, we make predictions for expected quiescent 7$ analyze main quenching mechanism. We find a simulated box $685~{\rm Mpc}$ side, first massive ($M_{\star} \sim 10^{11} {\rm M}_{\odot}$), Milky Way mass, low mass 10^{9.5} M}_{\odot}$...
ABSTRACT We model satellite quenching at z ∼ 1 by combining 14 massive (1013.8 < Mhalo/M⊙ 1015) clusters 0.8 1.3 from the GOGREEN and GCLASS surveys with accretion histories of 56 redshift-matched analogues IllustrisTNG simulation. Our fiducial model, which is parametrized time-scale (τquench), accounts for in our simulated population both time infall using observed coeval field quenched fraction after tuning τquench to reproduce versus stellar mass trend. This successfully reproduces...
Observations suggest that satellite quenching plays a major role in the build-up of passive, low-mass galaxies at late cosmic times. Studies satellites, however, are limited by ability to robustly characterize local environment and star-formation activity faint systems. In an effort overcome limitations existing data sets, we utilize deep photometry Stripe 82 Sloan Digital Sky Survey, conjunction with neural network classification scheme, study suppression star formation Universe. Using...
We present results from a Keck/DEIMOS survey to study satellite quenching in group environments at $z \sim 0.8$ within the Extended Groth Strip (EGS). target $11$ groups EGS with extended X-ray emission. obtain high-quality spectroscopic redshifts for member candidates, extending depths over an order of magnitude fainter than existing DEEP2/DEEP3 spectroscopy. This depth enables first measurement quiescent fraction down stellar masses $\sim 10^{9.5}~{\rm M}_{\odot}$ this redshift. By...
We explore models of massive ($\gt 10^{10}~{\rm M}_{\odot}$) satellite quenching in clusters at $z\gtrsim1$ using an MCMC framework, focusing on two primary parameters: $R_{\rm quench}$ (the host-centric radius which begins) and $τ_{\rm timescale upon a quenches after crossing quench}$). Our analysis shows local maxima the 1D posterior probability distribution approximately $0.25$ $1.0~R_{\rm{200}}$. Analyzing four distinct solutions quench}$-$R_{\rm parameter space, nearly all yield...
We model satellite quenching at $z \sim 1$ by combining $14$ massive ($10^{13.8} < M_{\mathrm{halo}}/\mathrm{M}_{\odot} 10^{15}$) clusters $0.8 z 1.3$ from the GOGREEN and GCLASS surveys with accretion histories of $56$ redshift-matched analogs IllustrisTNG simulation. Our fiducial model, which is parameterized timescale ($τ_{\rm quench}$), accounts for in our simulated population both time infall using observed coeval field quenched fraction after tuning $τ_{\rm quench}$ to reproduce...
Recent observations have shown that the environmental quenching of galaxies at z ~ 1 is qualitatively different to in local Universe. However, physical origin these differences has not yet been elucidated. In addition, while low-redshift comparisons between observed trends and predictions cosmological hydrodynamical simulations are now routine, there relatively few higher redshifts date. Here we confront three state-of-the-art suites (BAHAMAS+MACSIS, EAGLE+Hydrangea, IllustrisTNG) with field...