Galaxy and Cluster Biasing from Local Group Dynamics

Abstract

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.

7 pages, 5 figures, accepted for publication in MNRAS

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Cited by in corpus (6)

• Median Statistics and the Mass Density of the Universe
• The Dipole Anisotropy of the First All-Sky X-ray Cluster Sample
• Cosmological Evolution of Linear Bias
• Dynamical Constraints on the Local Group from the CMB and 2MRS Dipoles
• Two 100 Mpc-scale structures in the 3-D distribution of radio galaxies and their implications
• The 1-point PDF of the Initial Conditions of our Local Universe from the IRAS PSC redshift catalogue