Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-06-01
Astronomy and Astrophysics
Astrophysics
9 pages, 9 figures, resubmitted to MNRAS, added some references and convergence tests to better constrain bias
Scientific paper
10.1111/j.1365-2966.2008.12972.x
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.
Cohn Joanne D.
White Martin
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