Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227l..33b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. L33-L36.
Astronomy and Astrophysics
Astronomy
166
Black Holes (Astronomy), Supergiant Stars, X Ray Sources, Active Galactic Nuclei, Cygnus Constellation, Exosat Satellite, Noise Spectra, Power Spectra, Variability
Scientific paper
The aperiodic variability in the X-ray emission of Cyg X-1 is examined from 13 Exosat observations covering the period July 1983 - October 1985, by means of broad band 0.001-100 H3 power spectra. The total rms fractional variations in the range 0.016-14 Hz is between 28 and 38 percent. The power distribution is flat below a characteristic break frequency nu b, follows a power law with slope about 1 up to about 1 Hz, and then steepens to a slope of roughly -2. Some wiggles in the power spectra are also observed. The break frequency is observed to vary in the range 0.04-0.4, showing no correlation with the source flux. The results can be interpreted with a shot noise model with a distribution in shot times, in which the presence of long living shots determines the position of the break frequency nu b.
Belloni Tomaso
Hasinger Guenter
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