HEXE observations of black hole X-ray transients

Details HEXE observations of black hole X-ray transients HEXE observations of black hole X-ray transients

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..105d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 1, p. 105-112

Astronomy and Astrophysics

Astronomy

9

Black Holes (Astronomy), Stellar Models, X Ray Astronomy, X Ray Spectra, X Ray Stars, Compton Effect, Electron Energy, Error Analysis, Gamma Ray Observatory, Ginga Satellite, Light Curve, Mir Space Station, Photons

Scientific paper

We present results of Mir-Kvant-HEXE observations in the energy range 20-200 KeV of the three X-ray transients and black hole candidates GS 200+25, GRO J0422+32, and GS 2023+338, observed between 1988 and 1992. The spectra of GS 2023+338 GRO J0422+32 can be interpreted as due to thermal Compton-upscattering low-energy photons to hard X-ray energies in a hot plasma with electron temperatures of typically 35 to 40 keV, or as due to Compton reflection of hard photons off cool matter with covering factors fc ranging from 0.4 to 0.8. A combination of Compton-upscattering and Compton reflection is also possible. The spectrum of GX 200-25 is softer and can be described by a power law with a photon index alpha approximately = 2.0 (E greater than 20 keV).

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