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- W3100808324 abstract "The internal dynamics of a dark matter structure may have the remarkable property that the local temperature in the structure depends on direction. This is parameterized by the velocity anisotropy β which must be zero for relaxed collisional structures, but has been shown to be nonzero in numerical simulations of dark matter structures. Here, we present a method for inferring the radial profile of the velocity anisotropy of the dark matter halo in a galaxy cluster from X-ray observables of the intracluster gas. This nonparametric method is based on a universal relation between the dark matter temperature and the gas temperature which is confirmed through numerical simulations. We apply this method to observational data and we find that β is significantly different from zero at intermediate radii. Thus, we find a strong indication that dark matter is effectively collisionless on the dynamical timescale of clusters, which implies an upper limit on the self-interaction cross-section per unit mass σ/m ≲ 1 cm2 g−1. Our results may provide an independent way to determine the stellar mass density in the central regions of a relaxed cluster, as well as a test of whether a cluster is in fact relaxed." @default.
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- W3100808324 date "2008-12-01" @default.
- W3100808324 modified "2023-10-17" @default.
- W3100808324 title "MEASUREMENT OF THE DARK MATTER VELOCITY ANISOTROPY IN GALAXY CLUSTERS" @default.
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- W3100808324 doi "https://doi.org/10.1088/0004-637x/690/1/358" @default.
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