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SMM/HXRBS observations of Cygnus X-1 from 1986 December to 1988 AprilThe Solar Maximum Mission's Hard X-ray Burst Spectrometer made 30 measurements of Cygnus X-1 from December, 1986 to April, 1988, yielding a data set of broad synoptic coverage but limited duration for each data point. The hard X-ray intensity was found to be between the gamma(2) and gamma(3) levels, with a range of fluctuations about the average intensity level. The shape of the photon spectrum was found to be closest to that reported by Ling et al. (1983, 1987) during the time of the gamma(3) level emission, although the spectral shapes reported for the gamma(2) and gamma(1) levels were not precluded.
Document ID
19910061309
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Schwartz, R. A. (NASA Goddard Space Flight Center Greenbelt; ST Systems Corp., Lanham, MD, United States)
Orwig, L. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dennis, B. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ling, J. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wheaton, W. A. (JPL Pasadena, CA, United States)
Date Acquired
August 14, 2013
Publication Date
July 20, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 376
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS5-30440
CONTRACT_GRANT: NAS5-28572
Distribution Limits
Public
Copyright
Other