Dark Minihalos with Intermediate Mass Black Holes

We argue that the Milky Way (MW) contains 10³--10⁴ intermediate mass black holes (IMBHs) of mass ~10²⁻⁻³M_. Some IMBHs are naked, and some are enshrouded by dense dark minispikes and by minihalos of (10⁶--10⁷)M_. The IMBH is formed off-center by gas accretion in a minihalo. These dense minihalos (the nearest at about 2 kpc) survive mostly without tidal stripping by the MW, and are largely invisible except that their pointlike neutralino annihilation signals (with bolometric luminosities of 10³⁻⁻⁵L_50 GeVm_χ within 0.01--0.1 pc of their centers) stand out well above the MW background and are more luminous than outer dwarf satellite galaxies.