Long-term gamma-ray spectral variability of Cygnus X-1

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Abstract

view Abstract Citations (146) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Long-Term Gamma-Ray Spectral Variability of Cygnus X-1 Ling, J. C. ; Mahoney, W. A. ; Wheaton, Wm. A. ; Jacobson, A. S. Abstract The JPL HEAO 3 Gamma-Ray Spectroscopy experiment monitored the soft gamma-ray (0.05 - 10 MeV) emission of Cygnus X-1 for ≡90 days each in the fall of 1979 and spring of 1980. The source exhibited a steady increase of the 100 keV emission, by a factor of ≡3, during the first 70 days of observations. The spectrum obtained during the first 14 days of observations showed strong γ-ray emission in the 0.4 - 1.5 MeV band. As the 100 keV flux increased, the MeV flux disappeared, while the overall spectrum softened. The implications of these variations for the physical processes in the accretion disk are discussed. Publication: The Astrophysical Journal Pub Date: October 1987 DOI: 10.1086/185017 Bibcode: 1987ApJ...321L.117L Keywords: Black Holes (Astronomy); Cygnus Constellation; Gamma Ray Spectra; Hot Electrons; Relativistic Plasmas; X Ray Binaries; Computational Astrophysics; Light Curve; Astrophysics; BLACK HOLES; GAMMA RAYS: GENERAL; X-RAYS: BINARIES; X-RAYS: GENERAL; X-RAYS: SOURCES; X-RAYS: SPECTRA full text sources ADS | data products SIMBAD (1)

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