Galaxy and Cluster Biasing from Local Group Dynamics

Details Galaxy and Cluster Biasing from Local Group Dynamics Galaxy and Cluster Biasing from Local Group Dynamics

1999-12-19

arxiv.org/abs/astro-ph/9912406v1

Astronomy and Astrophysics

Astrophysics

7 pages, 5 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03178.x

Comparing the gravitational acceleration induced on the Local Group of galaxies by different tracers of the underline density field we estimate, within the linear gravitational instability theory and the linear biasing ansatz, their relative bias factors. Using optical SSRS2 galaxies, IRAS (PSCz) galaxies and Abell/ACO clusters, we find b_{O,I} ~ 1.21 +- 0.06 and b_{C,I} ~ 4.3 +- 0.8, in agreement with other recent studies. Finally, there is an excellent one-to-one correspondence of the PSCz and Abell/ACO cluster dipole profiles, once the latter is rescaled by b_{C,I}, out to at least ~150 h^{-1} Mpc.

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