Stochastic biasing of galaxies and dark halos in cosmological hydrodynamic simulations

Details Stochastic biasing of galaxies and dark halos in cosmological hydrodynamic simulations Stochastic biasing of galaxies and dark halos in cosmological hydrodynamic simulations

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pabei..19s..63y&link_type=abstract

"Progress in Astronomy, Vol. 19, Supp., p. 63 - 66 (2001). In: Proceedings of the Fourth China-Germany Workshop on Cosmology "Co

Astronomy and Astrophysics

Astronomy

Cosmology, Dark Matter, Galactic Halos, Hydrodynamic Simulations

Scientific paper

We investigate nonlinear and stochastic biasing of galaxies dark matter cores (DM cores) and dark halos using cosmological hydrodynamic simulations. We compare their biasing properties with the halo biasing model of Taruya & Suto. Dark halos in our simulation exhibit reasonable agreement with the predictions only on the scales larger than ~10h-1Mpc, while the volume exclusion effect due to their finite size underpopulated them on smaller scales. Interestingly, the biasing of galaxies and DM cores are in relatively good agreement with the theoretical predictions for halo biasing. We also find the clear dependence of galaxy biasing on their formation epoch. The distribution of old population of galaxies tightly correlate with underlying dark matter density field, while that of the young population is slightly more stochastic and anti-biased. Furthermore, the old population of galaxies selectively reside within massive halos, and the young galaxies are formed preferentially in smaller halos. Assuming that early and late-type galaxies correspond to the old and young population of galaxies in our simulation, respectively, all these segregations of galaxies are consistent with the observational results on the morphology dependent clustering of galaxies.

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