Observations of black hole candidates with the Mir-Kvant HEXE

Details Observations of black hole candidates with the Mir-Kvant HEXE Observations of black hole candidates with the Mir-Kvant HEXE

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989xras.rept....5d&link_type=abstract

In its Contributions of the X Ray Astronomy Group of the Max-Planck-Institut für Extraterrestrische Physik p 5-10 (SEE N90-24196

Astronomy and Astrophysics

Astronomy

1

Black Holes (Astronomy), Mir Space Station, Spectrum Analysis, X Ray Stars, Data Processing, Line Spectra, Plasma Spectra, X Ray Spectra

Scientific paper

The spectra and light curves, obtained with improved data processing techniques, of black hole candidates are presented. The three black hole candidates Cygnus X-1.GX339-4, and the x ray transient source GS2000+25 were observed with the High Energy X ray Experiment (HEXE) aboard the Soviet space station MIR. The spectra of Cygnus X-1 and GS2000+25 in the energy range from 30 to 180 keV deviate significantly from simple power laws and are compatible with either thermal bremsstrahlung from a hot and optically thin plasma or low energy photons comptonized to high x ray energies in a hot plasma cloud.

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