Abstract
Observations of intensity transitions in the X-ray emission from the black-hole candidate Cygnus X-1 (see ref. 1 and refs therein) were made by the Hakucho satellite2 during the summer of 1980 and are reported here. In addition, we report the results of hard (20–120 keV) X-ray observations of Cyg X-1. These data were obtained during the ‘high’ intensity state by balloon-borne mercuric iodide detectors, and are compared with data obtained at similar energies approximately 1 month earlier (A. Sheepmaker et al., in preparation) during the ‘low’ intensity state.
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Ogawara, Y., Mitsuda, K., Masai, K. et al. X-ray observations of the 1980 Cygnus X-1 ‘high state’. Nature 295, 675–676 (1982). https://doi.org/10.1038/295675a0
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DOI: https://doi.org/10.1038/295675a0
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