Evidence for a new variability in hard X-ray emission of CYG X-1

Details Evidence for a new variability in hard X-ray emission of CYG X-1 Evidence for a new variability in hard X-ray emission of CYG X-1

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..65..251j&link_type=abstract

Astrophysics and Space Science, vol. 65, no. 1, Sept. 1979, p. 251-254. Research supported by the Department of Space and Space

Astronomy and Astrophysics

Astronomy

Black Holes (Astronomy), Stellar Radiation, Variability, X Ray Sources, Radiant Flux Density, X Ray Astronomy

Scientific paper

From a systematic analysis of the available balloon data for searching variabilities in the time-scales of days for Cyg X-1, the first evidence for the existence of a distinct phase dependence of intensity at 30 keV, corresponding to a period of 5.6 days, is presented. Additionally, the existence of a two-state X-ray emission at these energies is also indicated. Implications of these variabilities on the existing models of Cyg X-1 are discussed

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