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We study whether the bias factors of galaxies can be unbiasedly recoveredfrom their power spectra and bispectra. We use a set of numerical N-bodysimulations and construct large mock galaxy catalogs based upon thesemi-analytical model of Croton et al. (2006). We measure the reduced bispectrafor galaxies of different luminosity, and determine the linear and firstnonlinear bias factors from their bispectra. We find that on large scales downto that of the wavenumber k=0.1h/Mpc, the bias factors b1 and b2 are nearlyconstant, and b1 obtained with the bispectrum method agrees very well with theexpected value. The nonlinear bias factor b2 is negative, except for the mostluminous galaxies with M<-23 which have a positive b2. The behavior of b2 ofgalaxies is consistent with the b2 mass dependence of their host halos. We showthat it is essential to have an accurate estimation of the dark matterbispectrum in order to have an unbiased measurement of b1 and b2. We also testthe analytical approach of incorporating halo occupation distribution to modelthe galaxy power spectrum and bispectrum. The halo model predictions do not fitthe simulation results well on the precision requirement of currentcosmological studies.

Determine the galaxy bias factors on large scales using bispectrum method