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24 April 2024

» arxiv » astro-ph/0507166

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The Dipole Anisotropy of the 2 Micron All-Sky Redshift Survey
P. Erdogdu ; J.P. Huchra ; O. Lahav ; M. Colless ; R.M. Cutri ; E. Falco ; T. George ; T. Jarrett ; D. H. Jones ; C.S. Kochanek ; L. Macri ; J. Mader ; N. Martimbeau ; M. Pahre ; Q. Parker ; A. Rassat ; W. Saunders ;
Date:	7 Jul 2005
Subject:	astro-ph
Abstract:	We estimate the acceleration on the Local Group (LG) from the Two Micron All Sky Redshift Survey (2MRS). This survey allows us to calculate the flux weighted dipole. The near-infrared flux weighted dipoles are very robust because they closely approximate a mass weighted dipole, bypassing the effects of redshift distortions and requiring no preferred reference frame. It is combined with the redshift information to derive the growth of dipole with distance. The misalignment angle between the LG and the CMB dipole drops to 15 +/- 7 deg at around 50 Mpc/h, but then increases at larger distances, reaching 24 +/- 9 deg at around 130 Mpc/h. The comparison of the 2MRS flux dipole and the CMB dipole provides an upper limit on the combination of the mass density and luminosity bias parameters Omega_m^0.6/b_L < 0.55 +/- 0.20.
Source:	arXiv, astro-ph/0507166
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