HOW WELL DO COSMOLOGICAL SIMULATIONS REPRODUCE INDIVIDUAL HALO PROPERTIES?
Michele Trenti, Britton D Smith, Eric J Hallman, Samuel W Skillman, J Michael Shull
The Astrophysical Journal | IOP PUBLISHING LTD | Published : 2010
Cosmological simulations of galaxy formation often rely on prescriptions for star formation and feedback that depend on halo properties such as halo mass, central overdensity, and virial temperature. In this paper, we address the convergence of individual halo properties, based on their number of particles N, focusing, in particular, on the mass of halos near the resolution limit of a simulation. While it has been established that the halo mass function is sampled on average down to N 20-30 particles, we show that individual halo properties exhibit significant scatter, and some systematic biases, as one approaches the resolution limit. We carry out a series of cosmological simulations using ..View full abstract
Awarded by NASA
Awarded by NSF
Awarded by National Science Foundation
We thank Zarija Lukic, Brian O'Shea, and Darren Reed for stimulating comments; Steffen Knollmann for his advice on compiling and running the Amiga halo-finder code; and an anonymous referee for useful suggestions. We acknowledge support from the University of Colorado Astrophysical Theory Program through grants from NASA (NNX07AG77G) and NSF (AST07-07474). This research was supported in part by the National Science Foundation through TeraGrid awards TG-AST090040 and TG-AST090101.