Rapid variability of 10-140 keV X-rays from Cygnus X-1

Details Rapid variability of 10-140 keV X-rays from Cygnus X-1 Rapid variability of 10-140 keV X-rays from Cygnus X-1

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..494n&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 494-501.

Astronomy and Astrophysics

Astronomy

88

Binary Stars, Stellar Mass Accretion, Stellar Spectra, Variable Stars, X Ray Sources, Black Holes (Astronomy), Compton Effect, Energy Spectra, Heao 1, Photons, Power Spectra, Spaceborne Astronomy

Scientific paper

On five occasions in 1977 and 1978, Cygnus X-1 was observed using the low-energy detectors of the UCSD/MIT Hard X-ray and Low-Energy Gamma Ray experiment on the HEAO 1 satellite. Rapid (times between 0.08 and 1000 sec) variability was found in the 10-140 keV band. The power spectrum was white for frequencies between 0.001 and 0.05 Hz and was proportional to the inverse of the frequency for frequencies between 0.05 and 3 Hz, indicating correlations on all time scales less than approximately 20 s. The shape of the energy spectrum was correlated with intensity; it was harder at higher intensity. If the emission is produced by Comptonization of a soft photon flux in a hot cloud, the heating of the cloud cannot be constant; it must vary on time scales up to approximately 20 s. A variable accretion rate could cause the observed effects.

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