Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..303g&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 303-307.
Astronomy and Astrophysics
Astronomy
25
Black Holes (Astronomy), Novae, Spaceborne Astronomy, Stellar Spectra, X Ray Stars, Emission Spectra, Light Curve, Positron Annihilation, Stellar Luminosity
Scientific paper
Attention is given to the GRANAT observations of Nova Muscae (GRS1124-684), spanned over a year, which revealed the source in three apparently different spectral states, corresponding to different epochs of the soft X-ray light curve: a spectrum with two distinct components (soft, below about 8 keV, and hard power-law tail with a slope of about 2.5, detected up to about 300 keV); a soft spectrum (without hard power law tail); and a hard power law spectrum with a slope of about 2.2. Thus, while the 3-300 keV luminosity decreased by more than an order of magnitude, the source passed through all the spectral states known for galactic black hole candidates. On January 20-21, 1991 the SIGMA telescope aboard GRANAT detected a relatively narrow variable emission line near 500 keV with a net flux of about 0.006 phot/s sq cm, most probably due to positron annihilation occurring in the source.
Ballet Jean
Churazov Eugene
D'yachkov A.
Gilfanov Marat
Goldwurm Andréa
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