Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..387d&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 387-392 (SEE N90-25711 19-89)
Astronomy and Astrophysics
Astronomy
8
Black Holes (Astronomy), Data Processing, Light Curve, Spaceborne Experiments, X Ray Sources, Bremsstrahlung, Mir Space Station, Plasma Clouds, Spectrum Analysis, Stellar Spectra, X Ray Spectra
Scientific paper
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 and light curves obtained with improved data processing techniques are presented. The spectra of Cygnus X-1 and GS2000+25 in the energy range from 30 to 180 keV deviate 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.
Doebereiner S.
Efremov Valeri
Englhauser Jakob
Kendziorra Eckhard
Maisack Michael
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