Gaia: a Window to Large Scale Flows

Details Gaia: a Window to Large Scale Flows Gaia: a Window to Large Scale Flows

2012-02-19

arxiv.org/abs/1202.4138v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 2 figures

Scientific paper

Using redshifts as proxy for galaxy distances, estimates of the 2D transverse peculiar velocities of distant galaxies ($cz\ltsim 2\times 10^4 \kms$) can be obtained from Gaia's measurements of proper motions. Owing to the large number of galaxies expected to be observed by Gaia, these transverse velocities are likely to supersede traditional probes of the large scale velocity field based on current and future distance indicator measurements. This Gaia probe of large scale motions is completely independent of any intrinsic relations between galaxy properties, hence it is essentially free of selection biases. It is also free from {homogeneous and} inhomogeneous Malmquist biases that typically plague distance indicator catalogs. Further, it provides additional information to traditional probes which yield line-of-sight peculiar velocities.

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