Milos Milosavljevic (Rutgers)
"Black hole mergers and implications for dark matter halo cores"


Accumulation of baryons at the center of a halo can displace the dark matter, converting singular density cusps into low-density cores. The displaced mass can be of order 10 M_b with M_b the mass of the infalling population. If M_b is identified with the masses of the black holes currently observed at the centers of bright galaxies, predicted core radii are at most a few hundred pc. Dark matter distribution at the center of a galaxy is shown to be strongly dependent on the galaxy's merger history. The effect of black hole mergers on sharp dark matter overdensities surrounding compact objects ("spikes") is most severe. In particular, the predicted flux of WIMP annihilation photons from such a spike at the Galactic center is several orders of magnitude smaller than in models that ignore the effects of SBHs and mergers.

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