Dark Minihalos with Intermediate Mass Black Holes

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Abstract
We argue that the Milky Way (MW) contains 10(3) - 10(4) intermediate mass black holes (IMBHs) of mass 10(2-3)M(circle dot). Some IMBHs are naked, and some are enshrouded by dense dark minispikes and by minihalos of (10(6) - 10(7)) M-circle dot. 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 10(3-5)L(circle dot) 50 GeV/m(x) 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.

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