Observations of rapid X-ray flaring from Cygnus X-1

Details Observations of rapid X-ray flaring from Cygnus X-1 Observations of rapid X-ray flaring from Cygnus X-1

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214l.119c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 214, June 15, 1977, p. L119-L122.

Astronomy and Astrophysics

Astronomy

23

Spaceborne Astronomy, Variable Stars, X Ray Sources, Flares, Sas, Shot Noise, X Ray Spectra

Scientific paper

SAS-3 observations of Cyg X-1 in October 1976 show the source to be in a highly active state exhibiting rapid continual flaring on time scales of 1 to 10 s. The flares exhibit temporal structure and variable spectra, but their mean spectrum is similar to that of the source as a whole. The characteristic time scales of the source are 2 to 4 times longer than those previously observed. It is suggested that this active phase of Cyg X-1 signals a modified accretion-disk structure. The flares may result from correlated bunches of the same 'shots ' which are thought to explain the rest of the short-time-scale variability of the source. While the flares superficially resemble X-ray bursts, they are distinct in several respects.

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