Black Holes in our Galactic Halo: Compatibility with FGST and PAMELA Data and Constraints on the First Stars

Understand

10 to 10^5 solar mass black holes with dark matter spikes that formed in early minihalos and still exist in our Milky Way Galaxy today are examined in light of recent data from the Fermi Gamma-Ray Space Telescope (FGST).

• The dark matter spikes surrounding black holes in our Galaxy are sites of significant dark matter annihilation.
• We examine the signatures of annihilations into gamma-rays, electrons and positrons, and neutrinos.
• We find that some significant fraction of the point sources detected by FGST might be due to dark matter annihilation near black holes in our Galaxy.