Dark minihalos with intermediate mass black holes.
We argue that the Milky Way (MW) contains 10(3)-10(4) intermediate mass black holes (IMBHs) of mass approximately 10(2-3)M. Some IMBHs are naked, and some are enshrouded by dense dark minispikes and by minihalos of (10(6)-10(7))M circle. 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 50 GeV / mChi 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.
Zhao
Hongsheng
H
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China.
Silk
Joseph
J