Absorption of dark matter by a supermassive black hole at the Galactic center: role of boundary conditions

Abstract

The evolution of the dark matter distribution at the Galactic center is analyzed, which is caused by the combination of gravitational scattering on Galactic bulge stars and absorption by a supermassive black hole at the center of the bulge. Attention is focused on the boundary condition on the black hole. It is shown that its form depends on the energy of dark matter particles. The modified flux of dark matter particles onto the black hole is calculated. Estimates of the amount of dark matter absorbed show that the fraction of dark matter in the total mass of the black hole may be significant. The density of dark matter at the central part of the bulge is calculated. It is shown that recently observed gamma radiation from the Galactic center can be attributed to the annihilation of dark matter with this density.

5 pages

References in corpus (3)

• The Stellar Cusp Around the Supermassive Black Hole in the Galactic Center
• Evolution of the Dark Matter Distribution at the Galactic Center
• Dark matter in galaxies and growth of giant black holes

Cited by in corpus (6)

• Physical laboratory at the center of the Galaxy
• Dark matter dynamics in Galactic center
• Dark matter concentrations in galactic nuclei according to polytropic models
• Dark matter and dark energy accretion onto intermediate-mass black holes
• Dark halo microphysics and massive black hole scaling relations in galaxies
• Gravitational and distributed heating effects of a cD galaxy on the hydrodynamical structure of its host cluster