Hard X-Ray Variability of Cygnus X-3
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 the 4.8 hr period and observed significant orbital modulation of the hard X-ray (is greater than or equal to 50 keV) flux, in conflict with some extrapolations from lower energies. The spectrum in the high state is consistent with a power law, varies as E (exp -3.0).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1994
- Accession Number
- ADA464762
Entities
People
- D. A> Grabelsky
- J. D. Kurfess
- M. P. Ulmer
- M. S> Strickman
- R. L. Kinzer
- S. M. Matz
- W. N. Johnson
- W. R. Purcell
Organizations
- Northwestern University