SMM/HXRBS observations of Cygnus X-1 from 1986 December to 1988 April

Schwartz, R. A.; Orwig, L. E.; Dennis, B. R.; Ling, J. C.; Wheaton, W. A.

The 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)

doi:10.1086/170281

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

Funding Number(s)

Distribution Limits

Public

Other

NTRS

NTRS - NASA Technical Reports Server