Long term variability of CYG X-1 in hard X-rays

Details Long term variability of CYG X-1 in hard X-rays Long term variability of CYG X-1 in hard X-rays

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..32..197f&link_type=abstract

Astrophysics and Space Science, vol. 32, Jan. 1975, p. 197-203.

Astronomy and Astrophysics

Astronomy

3

Balloon-Borne Instruments, Energy Spectra, Extraterrestrial Radiation, X Ray Astronomy, X Ray Stars, Long Term Effects, Radiant Flux Density, Uhuru Satellite

Scientific paper

Results of the analysis of four balloon observations of Cyg X-1 in the energy range 20-200 keV are reported. Long term time variability of the flux is confirmed and is estimated to amount to a factor 1.5-2. The source appears to remain in a state of lower flux for longer times. No obvious correlation with the low energy behaviour following the transition detected by Uhuru is found.

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