Physics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..19..113b&link_type=abstract
Advances in Space Research, Volume 19, Issue 1, p. 113-116.
Physics
Scientific paper
The non-relativistic temperature of the hard X-ray continuum in the spectrum of the black hole candidate 1E 1740.7-2942 during its hard state cannot be understood in terms of the conventional photon-photon pair production scenario's. The high pair creation rate during this state is indicated by the presence of a broad e^-e^+ annihilation line-like feature and needs the presence of a high temperature radiation field. We put forward a scenario in which the observed spectrum originates from the inner region of an accretion disk around a rapidly rotating black hole. For a not too high inclination angle, the gravitational redshift lowers the high local radiation temperature to the observed value. This mechanism necessitates a region of extremely strong gravity and is therefore unique for black holes. The presence of an annihilation line together with a low temperature X-ray continuum could therefore be considered as a black hole signature.
Belyanin Alexey
van Oss Roeland F.
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