X-ray observations of the 1980 Cygnus X-1 `high state'
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.
- Publication:
-
Nature
- Pub Date:
- February 1982
- DOI:
- 10.1038/295675a0
- Bibcode:
- 1982Natur.295..675O
- Keywords:
-
- Black Holes (Astronomy);
- Light Curve;
- Radiant Flux Density;
- X Ray Sources;
- Radiation Detectors;
- Spectral Correlation;
- X Ray Spectra;
- Astronomy