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The (re)ionisation of hydrogen in the early universe has a profound effect on the formation of the first galaxies: by raising the gas temperature and pressure, it prevents gas from cooling into small haloes thus affecting the abundance of…

星系天体物理 · 物理学 2018-09-12 Sownak Bose , Alis J. Deason , Carlos S. Frenk

We analyse a hydrodynamical simulation model for the recurrent heating of the central intracluster medium (ICM) by active galactic nuclei (AGN). Besides the self-gravity of the dark matter and gas components, our approach includes the…

天体物理学 · 物理学 2009-11-13 Debora Sijacki , Volker Springel

We present the galaxy optical luminosity function for the redshift range 0.05<z<0.75 from the AGN and Galaxy Evolution Survey (AGES), a spectroscopic survey of 7.6 sq. deg. in the Bootes field of the NOAO Deep Wide-Field Survey. Our…

We investigate galaxy sizes at redshift $z\gtrsim 6$ with the cosmological radiation-magneto-hydrodynamic simulation suite THESAN(-HR). These simulations simultaneously capture the reionization of the large-scale intergalactic medium and…

We present a study of nearby galaxies as a function of their [3.4]-[4.6] colour. Galaxies that are red in their [3.4]-[4.6] colour contain heated dust and the reddest systems ([3.4]-[4.6] > 0.5) are classified as AGN by some selection…

星系天体物理 · 物理学 2016-08-17 Jessica A. O'Connor , Jessica L. Rosenberg , Shobita Satyapal , Nathan J. Secrest

Hydrodynamical cosmological simulations are increasing their level of realism by considering more physical processes and having greater resolution or larger statistics. However, usually either the statistical power of such simulations or…

We present predictions drawn from cosmological hydrodynamic simulations for the physical, photometric and emission line properties of galaxies present during the latter stages of reionization from z=9-6. We find significant numbers of…

天体物理学 · 物理学 2009-11-11 Romeel Davé , Kristian Finlator , Benjamin D. Oppenheimer

We use hydrodynamic cosmological simulations to predict the star formation properties of high-redshift galaxies (z=2-6) in five variants of the inflationary cold dark matter scenario, paying particular attention to z=3, the redshift of the…

天体物理学 · 物理学 2009-10-31 David H. Weinberg , Lars Hernquist , Neal Katz

Motivated by evidences favoring a rapid and late hydrogen reionization process completing at z~5.2-5.5 and mainly driven by rare and luminous sources, we have reassessed the estimate of the space density of ultra-luminous QSOs at z~5 in the…

星系天体物理 · 物理学 2022-01-19 A. Grazian , E. Giallongo , K. Boutsia , G. Calderone , S. Cristiani , G. Cupani , F. Fontanot , F. Guarneri , Y. Ozdalkiran

During the last decades, rapid progress has been made in measurements of the rest-frame ultraviolet (UV) luminosity function (LF) for high-redshift galaxies ($z \geq 6$). The faint-end of the galaxy LF at these redshifts provides powerful…

宇宙学与河外天体物理 · 物理学 2019-08-07 Yueying Ni , Mei-Yu Wang , Yu Feng , Tiziana Di Matteo

We investigate the evolution of supermassive black holes in the `Evolution and Assembly of GaLaxies and their Environments' (EAGLE) cosmological hydrodynamic simulations. The largest of the EAGLE volumes covers a $(100 \,\rm cMpc)^3$ and…

The latest ALMA and JWST observations provide new information on the birth and evolution of galaxies in the early Universe, at the epoch of reionization. Of particular importance are measurements at redshift $ z > 5$ of their cold-gas…

星系天体物理 · 物理学 2025-01-15 Benedetta Casavecchia , Umberto Maio , Céline Péroux , Benedetta Ciardi

Photoionization by the high-redshift ultraviolet radiation background heats low density gas before it falls into dark matter potential wells, and it eliminates the neutral hydrogen and singly ionized helium that dominate cooling of…

天体物理学 · 物理学 2011-08-17 Anne A. Thoul , David H. Weinberg

We study the reionisation of the Universe by stellar sources using a numerical approach that combines fast 3D radiative transfer calculations with high resolution hydrodynamical simulations. Ionising fluxes for the sources are derived from…

天体物理学 · 物理学 2009-11-07 Aaron Sokasian , Tom Abel , Lars Hernquist , Volker Springel

We build a simple physical model to study the high-redshift active galactic Nucleus (AGN) evolution within the co-evolution framework of central black holes (BHs) and their host galaxies. The correlation between the circular velocity of a…

星系天体物理 · 物理学 2016-09-21 Jirong Mao , Minsun Kim

We present a suite of cosmological zoom-in simulations at z>5 from the Feedback In Realistic Environments project, spanning a halo mass range M_halo~10^8-10^12 M_sun at z=5. We predict the stellar mass-halo mass relation, stellar mass…

The spatial fluctuations of the extragalactic background light trace the total emission from all stars and galaxies in the Universe. A multi-wavelength study can be used to measure the integrated emission from first galaxies during…

Today's galaxies experienced cosmic reionization at different times in different locations. For the first time, reionization ($50\%$ ionized) redshifts, $z_R$, at the location of their progenitors are derived from new, fully-coupled…

We investigate emission line galaxies across cosmic time by combining the modified L-Galaxies semi-analytical galaxy formation model with the JiuTian cosmological simulation. We improve the tidal disruption model of satellite galaxies in…

星系天体物理 · 物理学 2024-04-02 Wenxiang Pei , Qi Guo , Ming Li , Qiao Wang , Jiaxin Han , Jia Hu , Tong Su , Liang Gao , Jie Wang , Yu Luo , Chengliang Wei

We simulate a plausible cosmological model in considerable physical and numerical detail through the successive phases of reheating (at 10<z<20), formation of Pop III stars at z=15 (due to molecular hydrogen cooling), with subsequent…

天体物理学 · 物理学 2009-10-28 Nickolay Y. Gnedin , Jeremiah P. Ostriker
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