The Halo Mass-Bias Redshift Evolution in the ΛCDM Cosmology

BASILAKOS S.; PLIONIS M.; RAGONE-FIGUEROA C.

ASTROPHYSICAL JOURNAL

University of Chicago Press

Lugar: Chicago, USA; Año: 2008 vol. 678 p. 627 - 634

0004-637X

We derive an analytic model for the redshift evolution of linear bias, allowing for interactions and merging of the mass tracers, by solving a second-order differential equation based on linear perturbation theory and the Friedmann-Lemaitre solutions of the cosmological field equations. We then study the halo-mass dependence of the bias evolution, using the dark matter halo distribution in a LCDM simulation in order to calibrate the free parameters of the model. Finally, we compare our theoretical predictions with available observational data and find a good agreement. In particular, we find that the bias of optical QSO´s evolve differently than those selected in X-rays and that their corresponding typical dark matter halo mass is ~1013 h-1 Msolar and >~5×1013 h-1 Msolar, respectively.