The non-gravitational interactions of dark matter in colliding galaxy clusters

Abstract

Collisions between galaxy clusters provide a test of the non-gravitational forces acting on dark matter. Dark matter's lack of deceleration in the `bullet cluster collision' constrained its self-interaction cross-section σ_DM/m < 1.25cm2/g (68% confidence limit) for long-ranged forces. Using the Chandra and Hubble Space Telescopes we have now observed 72 collisions, including both `major' and `minor' mergers. Combining these measurements statistically, we detect the existence of dark mass at 7.6σsignificance. The position of the dark mass has remained closely aligned within 5.8+/-8.2 kpc of associated stars: implying a self-interaction cross-section σ_DM/m < 0.47 cm2/g (95% CL) and disfavoring some proposed extensions to the standard model.

arXiv comment5 Pages, 4 Figures and 18 pages supplementary information

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