A Possible Bias Model for Quasars

Details A Possible Bias Model for Quasars A Possible Bias Model for Quasars

1998-04-10

arxiv.org/abs/astro-ph/9804106v1

Astrophys.J. 502 (1998) L95

Astronomy and Astrophysics

Astrophysics

accepted for publication in ApJ Letters; 11 pages with 3 figures included

Scientific paper

10.1086/311496

We propose that the majority of quasars at redshift $z\sim 1 - 5$ formed in the environment of new born collapsed halos with 1-D velocity dispersion $\sigma_v^{1d} \sim 400 \kms$. The harboring coefficient $f$ of quasars per halo and the lifetime of quasars depend only on local process, not modulated by the density inhomogeneities on scales larger than the size of the halos. Thus, the bias of quasars on scale larger than the size of these halos is mainly determined by the parameter $\sigma_v$ used for quasar environment identification. With this model, the popular structure formation models, like SCDM and LCDM, can be fairly well reconciled with the data of quasars, including a. observed feature of the environment for quasars; b. redshift evolution of quasar abundance; c. the two-point correlation functions of quasars. This bias model predicts that the correlation function of quasars doesn't significantly evolve, or only slightly increases with redshift.

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