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arXiv:0706.0208 (astro-ph)
[Submitted on 1 Jun 2007 (v1), last revised 4 Jan 2008 (this version, v2)]

Title:Dark matter halo abundances, clustering and assembly histories at high redshift

Authors:J.D. Cohn, Martin White
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Abstract: We use a suite of high-resolution N-body simulations to study the properties, abundance and clustering of high mass halos at high redshift, including their mass assembly histories and mergers. We find that the analytic form which best fits the abundance of halos depends sensitively on the assumed definition of halo mass, with common definitions of halo mass differing by a factor of two for these low concentration, massive halos. A significant number of massive halos are undergoing rapid mass accretion, with major merger activity being common. We compare the mergers and mass accretion histories to the extended Press-Schechter formalism.
We consider how major merger induced star formation or black hole accretion may change the distribution of photon production from collapsed halos, and hence reionization, using some simplified examples. In all of these, the photon distribution for a halo of a given mass acquires a large scatter. If rare, high mass halos contribute significantly to the photon production rates, the scatter in photon production rate can translate into additional scatter in the sizes of ionized bubbles.
Comments: 9 pages, 9 figures, resubmitted to MNRAS, added some references and convergence tests to better constrain bias
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.0208 [astro-ph]
  (or arXiv:0706.0208v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.0208
Related DOI: https://doi.org/10.1111/j.1365-2966.2008.12972.x

Submission history

From: Martin White [view email]
[v1] Fri, 1 Jun 2007 20:00:05 UTC (52 KB)
[v2] Fri, 4 Jan 2008 20:47:44 UTC (84 KB)
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