Gamma Ray Spectral Classes of Galactic Black Holes

Details Gamma Ray Spectral Classes of Galactic Black Holes Gamma Ray Spectral Classes of Galactic Black Holes

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.1601g&link_type=abstract

American Astronomical Society, 190th AAS Meeting, #16.01; Bulletin of the American Astronomical Society, Vol. 29, p.796

Astronomy and Astrophysics

Astronomy

Scientific paper

OSSE has observed more than 10 transient and persistent galactic black hole candidates. Two gamma-ray spectral classes are readily apparent and are the extensions of the X-ray low (hard) and high (soft) states. The X-ray low (hard) state extends into the low-energy gamma rays with an exponential cutoff ~ 100 keV. The spectral shape is consistent with thermal Comptonization. The majority of the luminosity in this state is carried by photons above 30 keV. The X-ray high (soft) extends as a fairly soft power law (photon number index >2) with no evidence for a cutoff at energies above 500 keV, in some cases. In this state, the ultrasoft X-ray excess contains the bulk of the luminosity.

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