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Abstract: Dark matter particles form halos that contribute the major part of the massof galaxy clusters. The formation of these cosmological structures have beeninvestigated both observationally and in numerical simulations, which haveconfirmed the existence of a universal mass profile. However, the dynamicbehaviour of dark matter in halos is not as well understood. We have usedobservations of 16 equilibrated galaxy clusters to show that the randomvelocities of dark matter particles are larger on average along the radialdirection than along the tangential, and that the magnitude of this velocityanisotropy is radially varying. Our measurement implies that the collectivebehaviour of dark matter particles is fundamentally different from that ofnormal particles and the radial variation of the anisotropy velocity agreeswith the predictions of numerical simulation.



Author: Ole Host

Source: https://arxiv.org/







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