HET-Discovery seminar by Kai Schmidt-Hoberg – University of Copenhagen

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HET-Discovery seminar by Kai Schmidt-Hoberg

The case for dark matter self interactions - evidence in Abell 3827?

I will review motivations for the existence of self interacting dark matter and discuss possible astrophysical observables. Self-interactions of dark matter particles can potentially lead to an observable separation between the dark matter halo and the stars of a galaxy moving through a region of large dark matter density. Such a separation has recently been observed in a galaxy falling into the core of the galaxy cluster Abell 3827. I discuss the DM self-interaction cross section needed to reproduce the observed effects.