S. Matz, D. Grabelsky, W. Purcell, M. Ulmer, W. Johnson, R. Kinzer, J. Kurfess, M. Strickman
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引用次数: 0
Abstract
The OSSE instrument on the Compton Gamma‐Ray Observatory (GRO) made 4 observations of Cygnus X–3 between May 1991 and December 1992. OSSE observed a substantial change in the average hard x‐ray flux, which has previously been observed to be stable (variations <20%). Over a 2–3 day period the flux above ∼50 keV decreased by roughly a factor of 3. This occurred about 15 days prior to a large radio flare from this source. OSSE detected by 4.8 hr period and observed significant orbital modulation of the hard x‐ray (≳50 keV) flux, in conflict with some extrapolations from lower energies. The spectrum in the high state is consistent with a power law, ∝E−3.0.
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