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Title: Cosmic Reionization On Computers: Reionization Histories of Present-day Galaxies

Journal Article · · The Astrophysical Journal (Online)
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Univ. of Chicago, IL (United States)
  2. Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics; Univ. of Chicago, IL (United States). Enrico Fermi Inst.
  3. Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics; Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Particle Astrophysics Center

We examine the reionization history of present-day galaxies by explicitly tracing the building blocks of halos from the Cosmic Reionization On Computers project. We track dark matter particles that belong to $z=0$ halos to trace the neutral fractions at corresponding positions during rapid global reionization. The resulting particle reionization histories allow us to explore different definitions of a halo's reionization redshift and to account for the neutral content of the interstellar medium. Consistent with previous work, we find a systematic trend of reionization redshift with mass - present day halos with higher masses have earlier reionization times. Finally, we quantify the spread of reionization times within each halo, which also has a mass dependence.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Heising-Simons Foundation
Grant/Contract Number:
AC02-07CH11359; AC02-06CH11357; NNX17AK65G
OSTI ID:
1545115
Report Number(s):
arXiv:1903.06179; FERMILAB-PUB-19-166-A; oai:inspirehep.net:1725212
Journal Information:
The Astrophysical Journal (Online), Vol. 882, Issue 2; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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