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Title: Warm Dark Matter and Cosmic Reionization

In models with dark matter made of particles with keV masses, such as a sterile neutrino, small-scale density perturbations are suppressed, delaying the period at which the lowest mass galaxies are formed and therefore shifting the reionization processes to later epochs. In this study, focusing on Warm Dark Matter (WDM) with masses close to its present lower bound, i.e., around the 3 keV region, we derive constraints from galaxy luminosity functions, the ionization history and the Gunn–Peterson effect. We show that even if star formation efficiency in the simulations is adjusted to match the observed UV galaxy luminosity functions in both CDM and WDM models, the full distribution of Gunn–Peterson optical depth retains the strong signature of delayed reionization in the WDM model. Furthermore, until the star formation and stellar feedback model used in modern galaxy formation simulations is constrained better, any conclusions on the nature of dark matter derived from reionization observables remain model-dependent.
Authors:
 [1] ;  [2] ;  [1]
  1. CSIC-Univ. de Valencia, Apartado de Correos (Spain)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); The Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Report Number(s):
FERMILAB-PUB-17-394-A; arXiv:1708.08277
Journal ID: ISSN 1538-4357; 1620173
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 852; Journal Issue: 2; Journal ID: ISSN 1538-4357
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; galaxies: formation; intergalactic medium; large-scale structure of universe; methods: numerical
OSTI Identifier:
1439284

Villanueva-Domingo, Pablo, Gnedin, Nickolay Y., and Mena, Olga. Warm Dark Matter and Cosmic Reionization. United States: N. p., Web. doi:10.3847/1538-4357/aa9ff5.
Villanueva-Domingo, Pablo, Gnedin, Nickolay Y., & Mena, Olga. Warm Dark Matter and Cosmic Reionization. United States. doi:10.3847/1538-4357/aa9ff5.
Villanueva-Domingo, Pablo, Gnedin, Nickolay Y., and Mena, Olga. 2018. "Warm Dark Matter and Cosmic Reionization". United States. doi:10.3847/1538-4357/aa9ff5.
@article{osti_1439284,
title = {Warm Dark Matter and Cosmic Reionization},
author = {Villanueva-Domingo, Pablo and Gnedin, Nickolay Y. and Mena, Olga},
abstractNote = {In models with dark matter made of particles with keV masses, such as a sterile neutrino, small-scale density perturbations are suppressed, delaying the period at which the lowest mass galaxies are formed and therefore shifting the reionization processes to later epochs. In this study, focusing on Warm Dark Matter (WDM) with masses close to its present lower bound, i.e., around the 3 keV region, we derive constraints from galaxy luminosity functions, the ionization history and the Gunn–Peterson effect. We show that even if star formation efficiency in the simulations is adjusted to match the observed UV galaxy luminosity functions in both CDM and WDM models, the full distribution of Gunn–Peterson optical depth retains the strong signature of delayed reionization in the WDM model. Furthermore, until the star formation and stellar feedback model used in modern galaxy formation simulations is constrained better, any conclusions on the nature of dark matter derived from reionization observables remain model-dependent.},
doi = {10.3847/1538-4357/aa9ff5},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 852,
place = {United States},
year = {2018},
month = {1}
}