Light and Motion in the Local Volume

Details Light and Motion in the Local Volume Light and Motion in the Local Volume

2004-12-03

arxiv.org/abs/astro-ph/0412090v1

Astrophys.J. 622 (2005) 217-234

Astronomy and Astrophysics

Astrophysics

47 pages, 12 figures, several long tables. Accepted by the Astrophysical Journal

Scientific paper

10.1086/428085

Using high-quality data on 149 galaxies within 10 megaparsecs (Mpc), I find no correlation between luminosity and peculiar velocity at all. There is no unequivocal sign on scales of 1-2 Mpc of the expected gravitational effect of the brightest galaxies, in particular infall toward groups; or of infall toward the Supergalactic Plane on any scale. Either dark matter is not distributed in the same way as luminous matter in this region, or peculiar velocities are not due to fluctuations in mass. The sensitivity of peculiar velocity studies to the background model is highlighted.

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