Warm Dark Matter and Cosmic Reionization
Abstract
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:
-
- CSIC-Univ. de Valencia, Apartado de Correos (Spain)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); The Univ. of Chicago, Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1439284
- Report Number(s):
- FERMILAB-PUB-17-394-A; arXiv:1708.08277
Journal ID: ISSN 1538-4357; 1620173; TRN: US1900592
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Volume: 852; Journal Issue: 2; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- 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
Citation Formats
Villanueva-Domingo, Pablo, Gnedin, Nickolay Y., and Mena, Olga. Warm Dark Matter and Cosmic Reionization. United States: N. p., 2018.
Web. doi:10.3847/1538-4357/aa9ff5.
Villanueva-Domingo, Pablo, Gnedin, Nickolay Y., & Mena, Olga. Warm Dark Matter and Cosmic Reionization. United States. https://doi.org/10.3847/1538-4357/aa9ff5
Villanueva-Domingo, Pablo, Gnedin, Nickolay Y., and Mena, Olga. 2018.
"Warm Dark Matter and Cosmic Reionization". United States. https://doi.org/10.3847/1538-4357/aa9ff5. https://www.osti.gov/servlets/purl/1439284.
@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},
url = {https://www.osti.gov/biblio/1439284},
journal = {The Astrophysical Journal (Online)},
issn = {1538-4357},
number = 2,
volume = 852,
place = {United States},
year = {Wed Jan 10 00:00:00 EST 2018},
month = {Wed Jan 10 00:00:00 EST 2018}
}
Web of Science
Figures / Tables:
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