The dipole anisotropy of the 2 micron all-sky redshift survey

Pirin Erdogdu, John Huchra, Ofer Lahav, Matthew Colless, Roc Cutri, Emilio Falco, T George, T Jarrett, David Jones, Christopher Kochanek, Lucas Macri, J Mader, Natalie Martimbeau, Michael Pahre, Quentin Parker, Anais Rassat, W Saunders

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We estimate the acceleration on the Local Group (LG) from the 2 Micron All-Sky Redshift Survey (2MRS). The sample used includes about 23 200 galaxies with extinction-corrected magnitudes brighter than and it 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 require no preferred reference frame. This is combined with the redshift information to determine the change in dipole with distance. The misalignment angle between the LG and the cosmic microwave background (CMB) dipole drops to at around , but then increases at larger distances, reaching at around . Exclusion of the galaxies Maffei 1, Maffei 2, Dwingeloo 1, IC342 and M87 brings the resultant flux dipole to away from the CMB velocity dipole. In both cases, the dipole seemingly converges by . 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.
Original languageEnglish
Pages (from-to)1515 - 1526
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - 2006
Externally publishedYes

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