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The infancy of cosmic reionization

Barkana, Rennan (2008) The infancy of cosmic reionization. Monthly Notices of the Royal Astronomical Society, 391 (2). pp. 727-737. ISSN 0035-8711. doi:10.1111/j.1365-2966.2008.13913.x.

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We consider the early stages of cosmic hydrogen or helium reionization, when ionizing sources were still rare. We show that Poisson fluctuations in the galaxy distribution substantially affected the early bubble size distribution, although galaxy clustering was also an essential factor even at the earliest times. We find that even at high redshifts, a significant fraction of the ionized volume resided in bubbles containing multiple sources, regardless of the ionizing efficiency of sources or of the reionization redshift. In particular, for helium reionization by quasars, one-source bubbles last dominated (i.e. contained 90 per cent of the ionized volume) at some redshift above z= 7.3 , and hydrogen reionization by stars achieved this milestone at z > 23 . For the early generations of atomic-cooling haloes or molecular-hydrogen-cooling haloes, one-source ionized regions dominated the ionized volume only at z > 31 and 48, respectively. To arrive at these results, we develop a statistical model for the effect of density correlations and discrete sources on reionization and solve it with a Monte Carlo method.

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Additional Information:© 2008 The Author. Journal compilation © 2008 RAS. Accepted 2008 September 1. Received 2008 August 30; in original form 2008 February 1. The author thanks Andrei Mesinger for very useful comments, and is grateful for support from the ICRR in Tokyo, Japan, the Moore Distinguished Scholar program at Caltech and the John Simon Guggenheim Memorial Foundation, as well as Israel Science Foundation grant 629/05.
Funding AgencyGrant Number
Institute for Cosmic Ray Research, University of TokyoUNSPECIFIED
Moore Distinguished Scholar program, CaltechUNSPECIFIED
John Simon Guggenheim Memorial FoundationUNSPECIFIED
Israel Science Foundation629/05
Subject Keywords:galaxies: formation – galaxies: high-redshift – cosmology: theory
Issue or Number:2
Record Number:CaltechAUTHORS:BARmnras08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12749
Deposited By: Archive Administrator
Deposited On:22 Dec 2008 20:26
Last Modified:08 Nov 2021 22:32

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