Constraints on the mass and abundance of black holes in the Galactic halo: the high mass limit

Details Constraints on the mass and abundance of black holes in the Galactic halo: the high mass limit Constraints on the mass and abundance of black holes in the Galactic halo: the high mass limit

1999-02-01

arxiv.org/abs/astro-ph/9902028v2

Astronomy and Astrophysics

Astrophysics

13 pages, 10 figures, revised version, in press, Monthly Notices

Scientific paper

10.1046/j.1365-8711.2000.03222.x

We establish constraints on the mass and abundance of black holes in the Galactic halo by determining their impact on globular clusters which are conventionally considered to be little evolved. Using detailed Monte Carlo simulations and simple analytic estimates, we conclude that, at Galactocentric radius R~8 kpc, black holes with masses M_bh >~(1-3) x 10^6 M_sun can comprise no more than a fraction f_bh ~ 0.025-0.05 of the total halo density. This constraint significantly improves those based on disk heating and dynamical friction arguments as well as current lensing results. At smaller radius, the constraint on f_bh strengthens, while, at larger radius, an increased fraction of black holes is allowed.

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