Connecting Reionization to the Local Universe

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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 ... continued below

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4 pages

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Alvarez, Marcelo A.; Busha, Michael; Abel, Tom; Wechsler, Risa H. & /KIPAC, Menlo Park August 3, 2009.

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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.

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4 pages

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  • Journal Name: Submitted to Astrophysical Journal Letters

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  • Report No.: SLAC-PUB-13722
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 962098
  • Archival Resource Key: ark:/67531/metadc927657

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  • August 3, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 15, 2016, 3:22 p.m.

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Alvarez, Marcelo A.; Busha, Michael; Abel, Tom; Wechsler, Risa H. & /KIPAC, Menlo Park. Connecting Reionization to the Local Universe, article, August 3, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc927657/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.