A5102948975- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Relativity and Gravitational Theory
- Astronomical Observations and Instrumentation
- Superconducting and THz Device Technology
- Remote Sensing in Agriculture
- Black Holes and Theoretical Physics
- Environmental Toxicology and Ecotoxicology
- Heavy Metal Exposure and Toxicity
- Plant Water Relations and Carbon Dynamics
- History and Theory of Mathematics
- Adaptive optics and wavefront sensing
- Mercury impact and mitigation studies
- Geophysics and Gravity Measurements
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
Flatiron Health (United States)
2017-2024
Flatiron Institute
2017-2024
Rutgers, The State University of New Jersey
2013-2024
Goddard Space Flight Center
2024
SRON Netherlands Institute for Space Research
2024
Jacksonville University
2020-2023
Space Telescope Science Institute
2010-2012
Max Planck Institute for Astronomy
2012
Johns Hopkins University
2010
Czech Academy of Sciences, Institute of Physics
1999-2001
We present a robust measurement and analysis of the rest-frame ultraviolet (UV) luminosity function at z=4-8. use deep Hubble Space Telescope imaging over CANDELS/GOODS fields, Ultra Deep Field Year 1 Frontier parallel observations. These surveys provides an effective volume 0.6-1.2 x 10^6 Mpc^3 this epoch, allowing us to perform search for faint (M_UV=-18) bright (M_UV < -21) galaxies. select candidate galaxies using well-tested photometric redshift technique with careful screening...
ABSTRACT The past decade has seen significant progress in understanding galaxy formation and evolution using large-scale cosmological simulations. While these simulations produce galaxies overall good agreement with observations, they employ different sub-grid models for supermassive black holes (BHs). We investigate the impact of on BH mass properties Illustris, TNG100, TNG300, Horizon-AGN, EAGLE, SIMBA simulations, focusing MBH − M⋆ relation function. All predict tight relations, struggle...
We investigate several approaches for constructing Monte Carlo realizations of the merging history virialized dark matter halos (``merger trees'') using extended Press-Schechter formalism. describe unsuccessful methods in order to illustrate some difficult aspects this problem. develop a practical method that leads reconstruction mean quantities such as conditional and overall mass functions given by model. This is convenient, computationally efficient, works any power spectrum or background...
ABSTRACT The similarity between the distributions of spins for galaxies (λgal) and dark-matter haloes (λhalo), indicated both by simulations observations, is naively interpreted as a one-to-one correlation galaxy its host halo. This used to predict sizes in semi-analytic models via Re ≃ fjλhaloRvir, where half-mass radius galaxy, fj angular momentum retention factor, Rvir halo radius. Using two suites zoom-in cosmological simulations, we find that λgal λhalo are fact barely correlated,...
Abstract Large-scale outflows in star-forming galaxies are observed to be ubiquitous and a key aspect of theoretical modeling galactic evolution, the focus Simulating Multiscale Astrophysics Understand Galaxies (SMAUG) project. Gas blown out from disks, similar gas within galaxies, consists multiple phases with large contrasts density, temperature, other properties. To study multiphase as emergent phenomena, we run suite rougly parsec-resolution local disk simulations using TIGRESS...
We present a novel set of stellar feedback models, implemented in the moving-mesh code Arepo, designed for galaxy formation simulations with near-parsec (or better) resolution. These include explicit sampling stars from IMF, allowing to be linked individual massive stars, an improved method modelling H II regions, photoelectric heating spatially varying FUV field and supernova feedback. perform suite 32 isolated $M_\mathrm{vir} = 10^{10}\,\mathrm{M_\odot}$ galaxies baryonic mass resolution...
We study the biasing relation between dark matter haloes or galaxies and underlying mass distribution, using cosmological N-body simulations in which are modelled via semi-analytic recipes. The non-linear, stochastic is quantified terms of mean function scatter about it as a time, scale object properties. shows general similarity characteristic shape, with no deep voids steep slope moderately underdense regions. At comoving ∼8h−1Mpc, non-linearity typically ≲10per cent stochasticity few tens...
We present the first set of maps and band-merged catalog from Herschel Stripe 82 Survey (HerS). Observations at 250, 350, 500 μm were taken with Spectral Photometric Imaging Receiver instrument aboard Space Observatory. HerS covers 79 deg2 along SDSS to an average depth 13.0, 12.9, 14.8 mJy beam−1 (including confusion) μm, respectively. was designed measure correlations external tracers dark matter density field—either point-like (i.e., galaxies selected radio X-ray) or extended clusters...
Now that ALMA is reaching its full capabilities, observations of sub-mm emission line deep fields become feasible. We couple a semi-analytic model galaxy formation with radiative transfer code to make predictions for the luminosity function CO J=1-0 up J=6-5 and [CII] at redshifts z=0-6. find that: 1) our correctly reproduces low- high-redshift galaxies available constraints on z<2.75; 2) we functions increase from z = 6 4, remain relatively constant till 1 rapidly decrease towards 0. The...
We present results on the evolution of intrinsic scatter black hole masses considering different implementations a model in which holes only grow via mergers. demonstrate how merger driven growth affects correlations between mass and host bulge mass. The simple case an initially lognormal distributed combined with random merging within galaxy population decreasing generation/number as predicted by central-limit theorem. In general we find that decrease σ is well approximated σmerg(m) ∼σini×...
We present a comparison of 14 galaxy formation models: 12 different semi-analytical models and 2 halo occupation distribution for based upon the same cosmological simulation merger tree information derived from it. The participating codes have proven to be very successful in their own right but they all been calibrated independently using various observational data sets, stellar models, trees. In this paper, we apply them without recalibration leads wide variety predictions mass function,...
Galactic outflows have density, temperature, and velocity variations at least as large that of the multiphase, turbulent interstellar medium (ISM) from which they originate. We conducted a suite parsec-resolution numerical simulations using TIGRESS framework, in emerge consequence interaction between supernovae (SNe) star-forming ISM. The outflowing gas is characterized by two distinct thermal phases, cool (T<10^4 K) hot (T>10^6 K), with most mass carried phase energy newly-injected metals...
A substantial number of ultra-high redshift (8 < z 17) galaxy candidates have been detected with JWST, posing the question: are these observational results surprising in context current formation models? We address this question using well-established Santa Cruz semi-analytic models, implemented within merger trees from new suite cosmological N-body simulations GUREFT, which were carefully designed for studies. Using our fiducial models calibrated at z=0, we present predictions stellar mass...
ABSTRACT While the first “seeds” of supermassive black holes (BH) can range from $\sim 10^2-10^6 \rm ~{\rm M}_{\odot }$, lowest mass seeds ($\lesssim 10^3~\rm {\rm }$) are inaccessible to most cosmological simulations due resolution limitations. We present our new BRAHMA that use a novel flexible seeding approach predict $z\ge 7$ BH populations for low-mass seeds. ran two types boxes model }$ using distinct but mutually consistent prescriptions at different simulation resolutions. First, we...
ABSTRACT JWST has revealed a large population of accreting black holes (BHs) in the early Universe. Recent work shown that even after accounting for possible systematic biases, high-z$M_*{\!-\!}M_{\rm \rm bh}$ relation can be above local scaling by $\gt 3\sigma$. To understand implications these overmassive high-z BHs, we study BH growth at $z\sim 4{\!-\!}7$ using $[18~\mathrm{Mpc}]^3$BRAHMA cosmological simulations with variations heavy seed models emulate direct collapse hole (DCBH)...
High-redshift quasars are believed to reside in highly biased regions of the Universe, where black hole (BH) growth is sustained by an enhanced number mergers and being at intersection filaments bringing fresh gas. This assumption should be supported enhancement counts galaxies field view quasars. While current observations quasar environments do not lead a consensus on possible excess galaxies, future missions JWST, WFIRST, Euclid will provide new insights environments, substantially...
ABSTRACT Arkenstone is a new model for multiphase, stellar feedback-driven galactic winds designed inclusion in coarse resolution cosmological simulations. In this first paper of series, we describe the features that allow to properly treat high specific energy wind components and demonstrate them using idealized non-cosmological simulations galaxy with realistic circumgalactic medium (CGM), arepo code. Hot, fast gas phases low mass loadings are predicted dominate content multiphase...
We combine a semi-analytic model of galaxy formation, tracking atomic and molecular phases cold gas, with three-dimensional radiative-transfer line tracing code to study the sub-mm emission from species (CO, HCN, [C舁i], [C舁ii], [O舁i]) in galaxies. compare physics that drives formation stars at epoch peak star (SF) Universe (z = 2.0) local find normal star-forming galaxies high redshift have much higher CO-excitation peaks than their counterparts CO cooling takes place excitation levels....
Both numerical hydrodynamic and semi-analytic cosmological models of galaxy formation struggle to match observed star histories galaxies in low-mass halos (MH ≲ 1011 M☉), predicting more at high redshift less low than observed. The fundamental problem is that galaxies' gas accretion rates are too closely coupled the models: rate largely drives rate. Observations point outpace redshift, resulting a buildup delay until lower redshifts. We present three empirical adjustments standard recipes...
The physical origin of the radial sizes galaxies and how galaxy are correlated with properties their host dark matter halos is an open question in formation. In observations, large-scale clustering selected by stellar mass significantly different for large small galaxies, Behroozi et al. (2022) showed that these results tension some correlations between size halo literature. We analyze IllustrisTNG suite volume cosmological hydrodynamic simulations along only matched initial conditions....
Dwarf galaxies have historically posed challenges to the cold dark matter (CDM) model and, while many of so-called 'dwarf galaxy problems' been mitigated by incorporating baryonic processes, observed diversity dwarf rotation curves remains a contentious topic. Meanwhile, growing observational samples active galactic nuclei (AGN) in prompted paradigm shift our understanding evolution, traditionally thought be regulated stellar feedback. In this study, we explore potential role AGN feedback...
Aims . We present a set of photometric catalogues primarily aimed at providing the community with comprehensive database for study galaxy populations in high-redshift Universe. The gathers data from eight JWST NIRCam observational programs, targeting Abell 2744 (GLASS-JWST, UNCOVER, DDT2756, and GO3990), EGS (CEERS), COSMOS UDS (PRIMER), GOODS North South (JADES NGDEEP) deep fields. This dataset covers total area ≃0.2 sq. degrees. Methods obtained estimates by means well-established...
We present a new approach to study galaxy evolution in cosmological context. combine merger trees and semi-analytic models of formation provide the initial conditions for multimerger hydrodynamic simulations. In this way, we exploit advantages simulations (high resolution inclusion gas physics) (cosmological background low computational cost), integrate them create novel tool. This allows us various properties, including treatment hot gaseous halo from which cools accretes on central disc,...
The distribution of galaxy morphological types is a key test for models formation and evolution, providing strong constraints on the relative contribution different physical processes responsible growth spheroidal components. In this paper, we make use suite semi-analytic to study efficiency mergers in disrupting discs building bulges. particular, compare standard prescriptions usually adopted models, with new proposed by Kannan et al., based results from high-resolution hydrodynamical...
We examine the properties of circumgalactic medium (CGM) at low redshift in a range simulated Milky Way mass halos. The sample is comprised seven idealized simulations, an adaptive mesh refinement cosmological zoom-in simulation, and two groups 50 halos with star forming or quiescent galaxies taken from IllustrisTNG100 simulation. simulations have very different setups, resolution, feedback models, but are analyzed uniform manner. By comparing median radial profiles distributions CGM...