Bias and Conditional Mass Function of Dark Halos Based on the Nonspherical Collapse Model

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Abstract
Nonspherical collapse is modeled, under the Zeldovich approximation, by six-dimensional random walks of the initial deformation tensor field. The collapse boundary adopted here is a slightly modified version of that proposed by Chiueh and Lee. Not only does the mass function agree with the fitting formula of Sheth and Tormen, but the bias function and conditional mass function constructed by this model are also found to agree reasonably well with the simulation results of Jing and Somerville et al., respectively. In particular, by introducing a small mass gap, we find a fitting formula for the conditional mass function, which works well even at small time intervals between parent and progenitor halos during the merging history.

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