A5076809913- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Advanced Thermodynamics and Statistical Mechanics
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Computational Physics and Python Applications
- Functional Brain Connectivity Studies
- Soil Carbon and Nitrogen Dynamics
- Genomics and Phylogenetic Studies
- Microbial Community Ecology and Physiology
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Peatlands and Wetlands Ecology
- Insurance, Mortality, Demography, Risk Management
- Geochemistry and Geologic Mapping
- Soil erosion and sediment transport
- History and Developments in Astronomy
Massachusetts Institute of Technology
2018-2025
California Institute of Technology
2019-2024
Moscow Institute of Thermal Technology
2024
Ministry of Water Resources of the People's Republic of China
2022
In this paper, we provide updated constraints on the bolometric quasar luminosity function (QLF) from $z=0$ to $z=7$. The are based an observational compilation that includes observations in rest-frame IR, B band, UV, soft and hard X-ray past decades. Our method follows Hopkins et al. 2007 with SED model extinction corrections. new best-fit behaves qualitatively different at high redshift. Compared old model, number density normalization decreases towards higher redshift bright-end slope is...
Abstract Recent discoveries of a significant population bright galaxies at cosmic dawn <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mfenced close=")" open="("> <mml:mrow> <mml:mi>z</mml:mi> <mml:mo>≳</mml:mo> <mml:mn>10</mml:mn> </mml:mrow> </mml:mfenced> </mml:math> have enabled critical tests cosmological galaxy formation models. In particular, the end galaxys’ UV luminosity functions (UVLFs) appear higher than predicted by many Using approximately...
ABSTRACT JWST observations have revealed a population of galaxies bright enough that potentially challenge standard galaxy formation models in the Λ cold dark matter (ΛCDM) cosmology. Using minimal empirical framework, we investigate influence variability on rest-frame ultra-violet (UV) luminosity function at z ≥ 9. Our study differentiates between median UV radiation yield and luminosities fixed halo mass. We primarily focus latter effect, which depends assembly processes can significantly...
ABSTRACT As they grow, galaxies can transition from irregular/spheroidal with ‘bursty’ star formation histories (SFHs), to discy smooth SFHs. But even in simulations, the direct physical cause of such transitions remains unclear. We therefore explore this a large suite numerical experiments re-running portions cosmological simulations widely varied physics, further validated existing FIRE simulations. show that gas supply, cooling/thermodynamics, model, Toomre scale, galaxy dynamical times,...
Abstract We present a comprehensive search and analysis of high-redshift galaxies in suite nine public JWST extragalactic fields taken Cycle 1, covering total effective area <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo>∼</mml:mo> <mml:mn>358</mml:mn> <mml:mspace width="0.25em"/> <mml:msup> <mml:mrow> <mml:mi>arcmin</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:math> . Through conservative (8 σ ) photometric selection, we identify 341 at 5...
The James Webb Space Telescop (JWST) promises to revolutionise our understanding of the early Universe, and contrasting its upcoming observations with predictions $\Lambda$CDM model requires detailed theoretical forecasts. Here, we exploit large dynamic range IllustrisTNG simulation suite, TNG50, TNG100, TNG300, derive multi-band galaxy luminosity functions from $z=2$ $z=10$. We put particular emphasis on exploration different dust attenuation models determine for rest-frame ultraviolet...
ABSTRACT Bose–Einstein condensate dark matter (BECDM, also known as fuzzy matter) is motivated by fundamental physics and has recently received significant attention a serious alternative to the established cold (CDM) model. We perform cosmological simulations of BECDM gravitationally coupled baryons investigate structure formation at high redshifts (z ≳ 5) for boson mass m = 2.5 × 10−22 eV, exploring dynamical effects its wavelike nature on cosmic web first galaxies. Our are directly...
ABSTRACT Line intensity mapping (LIM) is rapidly emerging as a powerful technique to study galaxy formation and cosmology in the high-redshift Universe. We present LIM estimates of select spectral lines originating from interstellar medium (ISM) galaxies 21 cm emission neutral hydrogen gas Universe using large volume, high resolution thesan reionization simulations. A combination subresolution photoionization modelling for H ii regions Monte Carlo radiative transfer calculations employed...
ABSTRACT Both observations and simulations have shown strong evidence for highly time-variable star formation in low-mass and/or high-redshift galaxies, which has important observational implications because galaxy samples are rest-ultraviolet (rest-UV) selected therefore particularly sensitive to the recent formation. Using a suite of cosmological ‘zoom-in’ at z &gt; 5 from Feedback Realistic Environments project, we examine bursty histories galaxies with JWST. We characterize how...
Abstract Many theories of dark matter beyond the weakly interacting massive particles paradigm feature an enhanced power spectrum on subparsec scales, leading to formation dense minihalos. Future local observations are promising search for and constrain such substructures. The survival probability these minihalos in Milky Way environment is crucial interpreting observations. In this work, we investigate two environmental effects: stellar disruption (smooth) tidal disruption. These mechanisms...
Abstract Using cosmological hydrodynamical zoom-in simulations, we explore the properties of subhalos in Milky Way analogs that contain a subcomponent atomic dark matter (ADM). ADM differs from cold (CDM) due to presence self-interactions lead energy dissipation, analogous standard model baryons. This can arise sectors are natural and theoretically motivated extensions model. The simulations used this work were carried out using GIZMO utilize FIRE-2 galaxy formation physics baryonic sector....
ABSTRACT We post-process galaxies in the IllustrisTNG simulations with skirt radiative transfer calculations to make predictions for rest-frame near-infrared (NIR) and far-infrared (FIR) properties of at z ≥ 4. The K- z-band galaxy luminosity functions from TNG are overall consistent observations, despite ${\sim}0.5\, \mathrm{dex}$ underprediction = 4 MK ≲ −25 Mz −24. Predictions JWST MIRI observed number counts given. Based on theoretical estimations, we show that next-generation survey...
ABSTRACT We combine the isothermal Jeans model and of adiabatic halo contraction into a semi-analytic procedure for computing density profile self-interacting dark-matter (SIDM) haloes with gravitational influence from inhabitant galaxies. The agrees well cosmological SIDM simulations over entire core-forming stage up to onset gravothermal core-collapse. Using this model, we show that response baryons is more diverse in than CDM depends sensitively on galaxy size, desirable feature context...
Abstract Dark sector theories naturally lead to multicomponent scenarios for dark matter where a subcomponent can dissipate energy through self-interactions, allowing it efficiently cool inside galaxies. We present the first cosmological hydrodynamical simulations of Milky Way analogs majority is collisionless cold (CDM) but (6%) strongly dissipative minimal atomic (ADM). The simulations, implemented in GIZMO and utilizing FIRE-2 galaxy formation physics model standard baryonic sector,...
Abstract We analyze the first cosmological baryonic zoom-in simulations of galaxies in dissipative self-interacting dark matter (dSIDM). The utilize FIRE-2 galaxy formation physics with inclusion self-interactions modeled as a constant fractional energy dissipation ( f diss = 0.75). In this paper, we examine properties dwarf M * ∼ 10 5 –10 9 ⊙ both isolation and within Milky Way–mass hosts. For isolated dwarfs, find more compact sizes promotion disk dSIDM σ / m ) ≤ 1 cm 2 g −1 . On contrary,...
ABSTRACT JWST has revealed a large population of UV-bright galaxies at $z\gtrsim 10$ and possibly overly massive 7$, challenging standard galaxy formation models in the ΛCDM cosmology. We use an empirical model to explore potential alleviating these tensions through Early Dark Energy (EDE) model, originally proposed solve Hubble tension. Our benchmark demonstrates excellent agreement with UV luminosity functions (UVLFs) $4\lesssim z \lesssim both EDE cosmologies. In cosmology, UVLF...
We contrast predictions for the high-redshift galaxy population and reionization history between cold dark matter (CDM) an alternative self-interacting model based on recently developed ETHOS framework that alleviates small-scale CDM challenges within Local Group. perform highest resolution hydrodynamical cosmological simulations (a 36 Mpc3 volume with gas cell mass of ∼ 105 M⊙ minimum softening 180 pc) to date - plus a counterpart quantify abundance galaxies at high redshift their impact...
ABSTRACT Recent observations with JWST have uncovered unexpectedly high cosmic star formation activity in the early Universe, mere hundreds of millions years after big bang. These are often understood to reflect an evolutionary shift efficiency (SFE) caused by changing galactic conditions during these epochs. We present FIREbox$^{\it HR}$, a high-resolution, cosmological hydrodynamical simulation from Feedback Realistic Environments (FIRE) project, which offers insights into SFE galaxies...
We present predictions for high redshift ($z=2-10$) galaxy populations based on the IllustrisTNG simulation suite and a full Monte Carlo dust radiative transfer post-processing. Specifically, we discuss ${\rm H}_{\alpha}$ H}_{\beta}$ + $[\rm O \,III]$ luminosity functions up to $z=8$. The predicted are consistent with observations at $z\lesssim 3$ $\lesssim 0.1\,{\rm dex}$ differences in luminosities. However, function is $\sim 0.3\,{\rm dimmer than observed one $z\simeq 2$. Furthermore,...
ABSTRACT We present the first set of cosmological baryonic zoom-in simulations galaxies including dissipative self-interacting dark matter (dSIDM). These utilize Feedback In Realistic Environments galaxy formation physics, but allow to have self-interactions analogous standard model forces, parametrized by self-interaction cross-section per unit mass, (σ/m), and dimensionless degree dissipation, 0 &lt; fdiss 1. survey this parameter space, constant velocity-dependent cross-sections,...
ABSTRACT Using high-resolution cosmological radiation-hydrodynamic (RHD) simulations (thesan-hr), we explore the impact of alternative dark matter (altDM) models on galaxies during Epoch Reionization. The adopt IllustrisTNG galaxy formation model. We focus altDM that exhibit small-scale suppression power spectrum, namely warm (WDM), fuzzy (FDM), and interacting (IDM) with strong acoustic oscillations (sDAO). In scenarios, both halo mass functions ultraviolet luminosity at z ≳ 6 are...
We investigate a self-interacting dark matter model featuring velocity-dependent cross section with an order-of-magnitude resonant enhancement of the at $\ensuremath{\sim}16\text{ }\text{ }\mathrm{km}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$. To understand implications for structure halos, we perform N-body simulations isolated halos mass $\ensuremath{\sim}{10}^{8}{M}_{\ensuremath{\bigodot}}$, halo selected to have maximum response resonance. track core formation and gravothermal collapse...
We investigate the central density structure of dark matter halos in cold (CDM) and self-interacting (SIDM) models using simulations that are part Feedback In Realistic Environments (FIRE) project. For simulated dwarf galaxy scale ($M_{\rm halo}(z=0)\approx 10^{10}\,M_\odot$), we study both dissipationless with full FIRE-2 formation physics. As has been demonstrated extensively recent years, baryonic feedback self-interactions can convert cusps into cores, former process doing so a manner...
Abstract JWST has enabled the detection of ultraviolet (UV) continuum galaxies at z > 10, revealing extremely blue, potentially dust-free galaxies. However, interpreting UV spectra is complicated by well-known degeneracy between stellar ages, dust reddening, and nebular continuum. The main goal this paper to develop a theoretical model for relationship galaxy slopes ( β ), bursty star formation histories, evolution, contributions using cosmological zoom-in simulations. We build layered...
Characterizing the evolution of star-forming main sequence (SFMS) at high redshift is crucial to contextualize observed extreme properties galaxies in early Universe. We present an analysis SFMS and its scatter THESAN-ZOOM simulations, where we find a normalization scaling as $\propto (1+z)^{2.64\pm0.03}$, significantly stronger than typically inferred from observations. can reproduce flatter by filtering out weakly galaxies, implying that current observational fits are biased due missing...