Evidence for Ring Caustics in the Milky Way

Details Evidence for Ring Caustics in the Milky Way Evidence for Ring Caustics in the Milky Way

2001-09-18

arxiv.org/abs/astro-ph/0109296v2

Phys.Lett. B567 (2003) 1-8

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures. Version to be published in Phys. Lett. B. The paper has been revised in response to comments by referees

Scientific paper

10.1016/S0370-2693(03)00863-3

The late infall of cold dark matter onto our galaxy produces discrete flows and caustics in its halo. The recently discovered ring of stars near galactocentric distance 20 kpc and a series of sharp rises in the Milky Way rotation curve are interpreted as due to the presence of caustic rings of dark matter in the galactic plane. Their locations are consistent at the 3% level with the predictions of the self-similar infall model for the caustic ring radii. Also, a triangular feature in the IRAS map of the galactic plane is consistent with the imprint of a caustic ring of dark matter upon the baryonic matter. These observations imply that the dark matter in our neighborhood is dominated by a single flow whose density and velocity vector are estimated.

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