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Title: Connecting Reionization to the Local Universe

Abstract

We present results of combined N-body and three-dimensional reionization calculations to determine the relationship between reionization history and local environment in a volume 1 Gpc h{sup -1} across and a resolution of about 1 Mpc. We resolve the formation of about 2 x 10{sup 6} halos of mass greater than {approx} 10{sup 12} M{sub {circle_dot}} at z = 0, allowing us to determine the relationship between halo mass and reionization epoch for galaxies and clusters. For our fiducial reionization model, in which reionization begins at z {approx} 15 and ends by z {approx} 6, we find a strong bias for cluster-size halos to be in the regions which reionized first, at redshifts 10 < z < 15. Consequently, material in clusters was reionized within relatively small regions, on the order of a few Mpc, implying that all clusters in our calculation were reionized by their own progenitors. Milky Way mass halos were on average reionized later and by larger regions, with a distribution most similar to the global one, indicating that low mass halos are nearly uncorrelated with reionization when only their mass is taken as a prior. On average, we find that most halos with mass less than 10{supmore » 13} M{sub {circle_dot}} were reionized internally, while almost all halos with masses greater than 10{sup 14} M{sub {circle_dot}} were reionized by their own progenitors. We briefly discuss the implications of this work in light of the 'missing satellites' problem and how this new approach may be extended further.« less

Authors:
; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
962098
Report Number(s):
SLAC-PUB-13722
arXiv:0812.3405; TRN: US200916%%48
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
Submitted to Astrophysical Journal Letters
Additional Journal Information:
Journal Name: Submitted to Astrophysical Journal Letters
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DISTRIBUTION; GALAXIES; MILKY WAY; RESOLUTION; SATELLITES; UNIVERSE; Astrophysics,

Citation Formats

Alvarez, Marcelo A, Busha, Michael, Abel, Tom, Wechsler, Risa H, and /KIPAC, Menlo Park. Connecting Reionization to the Local Universe. United States: N. p., 2009. Web. doi:10.1088/0004-637X/703/2/L167.
Alvarez, Marcelo A, Busha, Michael, Abel, Tom, Wechsler, Risa H, & /KIPAC, Menlo Park. Connecting Reionization to the Local Universe. United States. https://doi.org/10.1088/0004-637X/703/2/L167
Alvarez, Marcelo A, Busha, Michael, Abel, Tom, Wechsler, Risa H, and /KIPAC, Menlo Park. 2009. "Connecting Reionization to the Local Universe". United States. https://doi.org/10.1088/0004-637X/703/2/L167. https://www.osti.gov/servlets/purl/962098.
@article{osti_962098,
title = {Connecting Reionization to the Local Universe},
author = {Alvarez, Marcelo A and Busha, Michael and Abel, Tom and Wechsler, Risa H and /KIPAC, Menlo Park},
abstractNote = {We present results of combined N-body and three-dimensional reionization calculations to determine the relationship between reionization history and local environment in a volume 1 Gpc h{sup -1} across and a resolution of about 1 Mpc. We resolve the formation of about 2 x 10{sup 6} halos of mass greater than {approx} 10{sup 12} M{sub {circle_dot}} at z = 0, allowing us to determine the relationship between halo mass and reionization epoch for galaxies and clusters. For our fiducial reionization model, in which reionization begins at z {approx} 15 and ends by z {approx} 6, we find a strong bias for cluster-size halos to be in the regions which reionized first, at redshifts 10 < z < 15. Consequently, material in clusters was reionized within relatively small regions, on the order of a few Mpc, implying that all clusters in our calculation were reionized by their own progenitors. Milky Way mass halos were on average reionized later and by larger regions, with a distribution most similar to the global one, indicating that low mass halos are nearly uncorrelated with reionization when only their mass is taken as a prior. On average, we find that most halos with mass less than 10{sup 13} M{sub {circle_dot}} were reionized internally, while almost all halos with masses greater than 10{sup 14} M{sub {circle_dot}} were reionized by their own progenitors. We briefly discuss the implications of this work in light of the 'missing satellites' problem and how this new approach may be extended further.},
doi = {10.1088/0004-637X/703/2/L167},
url = {https://www.osti.gov/biblio/962098}, journal = {Submitted to Astrophysical Journal Letters},
number = ,
volume = ,
place = {United States},
year = {Mon Aug 03 00:00:00 EDT 2009},
month = {Mon Aug 03 00:00:00 EDT 2009}
}