Dynamical Constraints on the Local Group from the CMB and 2MRS Dipoles

Abstract

We place constraints on the dynamics of the Local Group (LG) by comparing the dipole of the Cosmic Microwave Background (CMB) with the peculiar velocity induced by the 2MRS galaxy sample. The analysis is limited by the lack of surveyed galaxies behind the Zone of Avoidance (ZoA). We therefore allow for a component of the LG velocity due to unknown mass concentrations behind the ZoA, as well as for an unknown transverse velocity of the Milky Way relative to the Andromeda galaxy. We infer extra motion along the direction of the Galactic center (where Galactic confusion and dust obscuration peaks) at the 95% significance level. With a future survey of the ZoA it might be possible to constrain the transverse velocity of the Milky Way relative to Andromeda.

5 pages, 2 figures, Accepted for publication in MNRAS

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Cited by in corpus (25)

• The Bar and Spiral Structure Legacy (BeSSeL) Survey: Mapping the Milky Way with VLBI Astrometry
• The Parkes HI Zone of Avoidance Survey
• Discovery of a supercluster in the ZOA in Vela
• The 2MASS Redshift Survey in the Zone of Avoidance
• The WSRT ZoA Perseus-Pisces Filament wide-field HI imaging survey I. HI catalogue and atlas
• The 2MASS redshift survey galaxy group catalogue derived from a graph-theory based friends-of-friends algorithm
• J004457+4123 (Sharov 21): not a remarkable nova in M31 but a background quasar with a spectacular UV flare
• The Nancay HI Zone of Avoidance survey of 2MASS bright galaxies
• The Density Contrast of the Shapley Supercluster
• Deep NIR photometry of HI galaxies in the Zone of Avoidance
• The ALFA ZOA Deep Survey: First Results
• Determining the motion of the solar system relative to the cosmic microwave background using type Ia supernovae
• NIR Tully-Fisher in the Zone of Avoidance. - II. 21 cm HI-line spectra of southern ZOA galaxies
• A Zone of Avoidance catalogue of 2MASS bright galaxies. I. Sample description and analysis
• On How to Extend the NIR Tully-Fisher Relation to be Truly All-Sky
• HI line observations of 2MASS galaxies in the Zone of Avoidance
• Tidal Effects on the Spatial Structure of the Local Group
• Is the misalignment of the Local Group velocity and the 2MASS Redshift Survey dipole typical in a LambdaCDM model?
• Galaxy clusters in the Vela supercluster. -- I. Deep NIR catalogues
• The Arecibo L-band Feed Array Zone of Avoidance (ALFAZOA) Shallow Survey
• Discovery and Follow-up of a Nearby Galaxy from the Arecibo Zone of Avoidance Survey
• The kinetic Sunyaev-Zel'dovich effect from the diffuse gas in the Local Group
• Reconstructing the Peculiar Velocity of the Local Group with Modified Gravity and 2MASS
• Influence of the Local Void on measurements of the clustering dipole
• Motion of the Local Group as a cosmological probe