The black-hole candidate GRO J0422+32: MeV emission measured with COMPTEL.

Details The black-hole candidate GRO J0422+32: MeV emission measured with COMPTEL. The black-hole candidate GRO J0422+32: MeV emission measured with COMPTEL.

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296l..33v&link_type=abstract

Astronomy and Astrophysics, v.296, p.L33

Physics

23

Gamma Rays: Observations, Black-Hole Physics, Binaries: General

Scientific paper

On Aug. 5, 1992, BATSE detected the bright soft X-ray transient GRO J0422+32,also known as Nova Per 1992. The COMPTEL instrument (0.75-30MeV) aboard the Compton Gamma-Ray Observatory (CGRO) observed this black-hole candidate twice. During the first observation, which started when the X-ray flux was at its maximum, GRO J0422+32 was detected between 1 and 2MeV. The flux in this energy range was higher than expected from an extrapolation of the standard Sunyaev-Titarchuk Comptonisation model fits to the contemporaneous OSSE and SIGMA data. We discuss several models that may explain the total hard-X/γ-ray spectrum, including the generalised Comptonisation model from Titarchuk. During the second observation, 3 weeks later, no evidence for emission above 1MeV was seen.

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