Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pazh...17..291s&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 17, April 1991, p. 291-309. In Russian. In Russian. In Russian.
Astronomy and Astrophysics
Astronomy
3
Novae, Stellar Luminosity, X Ray Spectra, X Ray Stars, Astronomical Observatories, Black Holes (Astronomy), X Ray Astronomy
Scientific paper
During observations made by the Roentgen observatory on board the Kvant module from June to August 1989, an X-ray spectrum of the X-ray nova GS2023 + 338 was detected in the energy band 2-300 keV. The source position was localized with an accuracy of 25 arcsec. The continuous decrease of X-ray luminosity, common to all X-ray novae, and strong chaotic variability were detected during the observations. The hard X-ray spectrum and low frequency noise detected permit this source to be classified as a black hole candidate. The spectra measured are the hardest X-ray spectra ever in the history of X-ray astronomy. The source luminosity in the 2-300 keV energy band was found, on June 10, to be 8 x 10 to the 36th (D/kpc)-squared erg/s where D is the distance to the source in kpc.
Aref'ev V.
Borozdin Konstantin
Efremov Valeri
Gilfanov Marat
Kaniovskij A.
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