Computer Science
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..210d&link_type=abstract
Nature, vol. 287, Sept. 18, 1980, p. 210-212.
Computer Science
6
Stellar Mass Accretion, Stellar Temperature, X Ray Sources, X Ray Stars, Compton Effect, Cygnus Constellation, Photons, Stellar Models
Scientific paper
Recent theoretical models of Cyg X-1 assume that to explain the observed time-averaged spectrum the hard X rays are emitted by inverse-Compton mechanism from an optically thin, hot accretion disk around a black hole. Numerous observations (especially in the energy range not less than 20 keV) have shown that the source intensity is variable on different time scales. Short-term variability on the time scale of about 1 s is especially conspicuous because of its stationary nature and the stability of time scale. A balloon observation was carried out to study the variability in the hitherto unknown hard X-ray range (not less than 20 keV). The results of the analysis, together with those of the former rocket observation, suggest that the variation is essentially spectral, implicating that it originates from temperature fluctuation in an accretion disk. Such a model is discussed here in detail.
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