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

Journal Article · Fri Sep 13 00:00:00 EDT 2019 · Astrophys.J.

DOI:https://doi.org/10.3847/1538-4357/ab3794· OSTI ID:1545115

Zhu, Hanjue ^[1]; Avestruz, Camille ^[2]; Gnedin, Nickolay Y. ^[3]

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1. Chicago U.
2. Chicago U., KICP; Chicago U., EFI
3. Fermilab; Chicago U., KICP; Chicago U., Astron. Astrophys. Ctr.

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: Chicago U.; Chicago U., Astron. Astrophys. Ctr.; Chicago U., EFI; Chicago U., KICP; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: US Department of Energy
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1545115
• Report Number(s): FERMILAB-PUB-19-166-A; oai:inspirehep.net:1725212; arXiv:1903.06179
• Journal Information: Astrophys.J., Journal Name: Astrophys.J. Vol. 882
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
dark ages
first stars
galaxies: high-redshift
methods: numerical
reionization