Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...389l..75s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 389, April 20, 1992, p. L75-L78.
Astronomy and Astrophysics
Astronomy
114
Annihilation Reactions, Black Holes (Astronomy), Light Curve, Line Spectra, Novae, X Ray Stars, Emission Spectra, Stellar Spectra, X Ray Spectra, X Ray Telescopes
Scientific paper
On 1991 January 20-21, the SIGMA telescope on board GRANAT detected a relatively narrow variable emission line near 500 keV with net flux of about 0.006 photons/s/sq cm in the spectrum of the X-ray Nova Muscae. During 1991 January 9-August 14, the spectrum had a strong hard component extending up to about 300 keV with average power-law photon index about 2.5. This component varies by a factor about 2 on time scales of hours. The hard component was absent only once, on April 12, but it reappeared during subsequent observations on May 31 and August 14. In contrast to the soft component, the light curve of the hard X-ray component does not decay exponentially, and so its relative contribution to the luminosity increased with time.
Ballet Jean
Churazov Eugene
Cordier Bertand
D'yachkov A.
Denis Miroslav
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