The Dipole Anisotropy of the 2mass Redshift Survey

Details The Dipole Anisotropy of the 2mass Redshift Survey The Dipole Anisotropy of the 2mass Redshift Survey

2006-05-14

arxiv.org/abs/astro-ph/0605343v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, Contribution to Rencontres de Moriond: Contents and Structures of the Universe, March 18-25, 2006, La Thui

Scientific paper

We estimate the flux weighted acceleration on the Local Group (LG) from the near-infrared Two Micron All Sky Redshift Survey (2MRS). The near-infrared flux weighted dipoles are very robust because they closely approximate a mass weighted dipole, bypassing the effects of redshift distortions and require no preferred reference frame. We use this method with the redshift information to determine the change in dipole with distance. The LG dipole seemingly converges by 60 Mpc/h. Assuming convergence, the comparison of the 2MRS flux dipole and the CMB dipole provides a value for the combination of the mass density and luminosity bias parameters Omega_m^0.6/b_L= 0.40+/-0.09.

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