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- Title
The hard X-ray spectrum of Cyg X-1 during the transition in November 1975.
- Authors
SOMMER, M.; MAURUS, H.; URBACH, R.
- Abstract
WE wish to report an observation of the hard X-ray spectrum of Cyg X-1 during a transition to the high state in November 1975. The measurement was obtained with a balloon-borne X-ray detector in the 25-150 keV range. This third upward transition of Cyg X-1 in 1975 was also detected in the few-keV energy range by the Ariel V all-sky monitor (S. S. Holt, L. J. Kaluzienski, E. A. Boldt, and P. J. Serlemitsos, unpublished). Our high energy data seem to confirm the characteristic spectral time variation of Cyg X-1: a soft X-ray intensity increase is correlated with a decrease of the hard X-ray intensity. The similarity of Cyg X-1 and the transient source A0620-00 with respect to such spectral variation has been pointed out by Coe et al.1.
- Publication
Nature, 1976, Vol 263, Issue 5580, p752
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/263752a0