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Title: Cosmic reionization on computers: The faint end of the galaxy luminosity function

Using numerical cosmological simulations completed under the “Cosmic Reionization On Computers” project, I explore theoretical predictions for the faint end of the galaxy UV luminosity functions at $$z\gtrsim 6$$. A commonly used Schechter function approximation with the magnitude cut at $${M}_{{\rm{cut}}}\sim -13$$ provides a reasonable fit to the actual luminosity function of simulated galaxies. When the Schechter functional form is forced on the luminosity functions from the simulations, the magnitude cut $${M}_{{\rm{cut}}}$$ is found to vary between -12 and -14 with a mild redshift dependence. Here, an analytical model of reionization from Madau et al., as used by Robertson et al., provides a good description of the simulated results, which can be improved even further by adding two physically motivated modifications to the original Madau et al. equation.
Authors:
 [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Report Number(s):
FERMILAB-PUB-16-117-A; arXiv:1603.07729
Journal ID: ISSN 2041-8213; 1434942
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 825; Journal Issue: 2; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmology: theory; cosmology: large-scale structure of universe; galaxies: formation; galaxies: intergalactic medium; methods: numerical
OSTI Identifier:
1260386

Gnedin, Nickolay Y. Cosmic reionization on computers: The faint end of the galaxy luminosity function. United States: N. p., Web. doi:10.3847/2041-8205/825/2/L17.
Gnedin, Nickolay Y. Cosmic reionization on computers: The faint end of the galaxy luminosity function. United States. doi:10.3847/2041-8205/825/2/L17.
Gnedin, Nickolay Y. 2016. "Cosmic reionization on computers: The faint end of the galaxy luminosity function". United States. doi:10.3847/2041-8205/825/2/L17. https://www.osti.gov/servlets/purl/1260386.
@article{osti_1260386,
title = {Cosmic reionization on computers: The faint end of the galaxy luminosity function},
author = {Gnedin, Nickolay Y.},
abstractNote = {Using numerical cosmological simulations completed under the “Cosmic Reionization On Computers” project, I explore theoretical predictions for the faint end of the galaxy UV luminosity functions at $z\gtrsim 6$. A commonly used Schechter function approximation with the magnitude cut at ${M}_{{\rm{cut}}}\sim -13$ provides a reasonable fit to the actual luminosity function of simulated galaxies. When the Schechter functional form is forced on the luminosity functions from the simulations, the magnitude cut ${M}_{{\rm{cut}}}$ is found to vary between -12 and -14 with a mild redshift dependence. Here, an analytical model of reionization from Madau et al., as used by Robertson et al., provides a good description of the simulated results, which can be improved even further by adding two physically motivated modifications to the original Madau et al. equation.},
doi = {10.3847/2041-8205/825/2/L17},
journal = {The Astrophysical Journal. Letters},
number = 2,
volume = 825,
place = {United States},
year = {2016},
month = {7}
}