Accreting isolated black holes and the unidentified EGRET sources

Details Accreting isolated black holes and the unidentified EGRET sources Accreting isolated black holes and the unidentified EGRET sources

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410.1275d&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 1275-1279 (1997).

Computer Science

6

Black Holes, Gamma-Ray Sources, Gamma-Ray Bursts, Accretion And Accretion Disks

Scientific paper

Many of the unidentified >100 MeV EGRET γ-ray sources are conjectured to originate from a population of isolated ~10-100 Msolar black holes accreting from the ISM. The low-latitude sources are mostly distant (~several kpc) black holes accreting from high density molecular gas, whereas the medium latitude sources are black holes within a few hundred pc which accrete from the more tenuous local ISM. The γ-ray luminosity is assumed to be proportional to the Bondi-Hoyle accretion rate, and the nearby and distant sources have γ-ray powers of <~1033 ergs s-1 and >~1035 ergs s-1, respectively, in both cases far below the Eddington luminosity. The number of sources is compatible with estimates of black hole formation rates. In contrast to a pulsar origin for the unidentified sources, this model can account for γ-ray flux variability.

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