Constraining the Collisional Nature of the Dark Matter Through Observations of Gravitational Wakes

Details Constraining the Collisional Nature of the Dark Matter Through Observations of Gravitational Wakes Constraining the Collisional Nature of the Dark Matter Through Observations of Gravitational Wakes

2001-07-30

arxiv.org/abs/astro-ph/0107567v1

Astronomy and Astrophysics

Astrophysics

29 pages, 3 figures, submitted to ApJ

Scientific paper

10.1086/324693

We propose to use gravitational wakes as a direct observational probe of the collisional nature of the dark matter. We calculate analytically the structure of a wake generated by the motion of a galaxy in the core of an X-ray cluster for dark matter in the highly-collisional and collisionless limits. We show that the difference between these limits can be recovered from detailed X-ray or weak lensing observations. We also discuss the sizes of sub-halos in these limits. Preliminary X-ray data on the motion of NGC 1404 through the Fornax group disfavors fluid-like dark matter but does not exclude scenarios in which the dark matter is weakly collisional.

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