CYG X-1 - A candidate of the black hole

Details CYG X-1 - A candidate of the black hole CYG X-1 - A candidate of the black hole

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ssrv...20..757o&link_type=abstract

Space Science Reviews, vol. 20, Sept. 1977, p. 757-813.

Astronomy and Astrophysics

Astronomy

99

Black Holes (Astronomy), X Ray Stars, Astronomical Spectroscopy, Binary Stars, Radio Astronomy, Stellar Mass Accretion, X Ray Astronomy

Scientific paper

Available optical, X-ray, and radio data on Cygnus X-1 are reviewed. Optical parameters of the binary companion HDE 226868 are reviewed, including its spectral classification, spectroscopic characteristics, orbital elements, distance, light variations, and polarization. Arguments for and against the presence of a black hole in the Cyg X-1 system are outlined, and it is noted that the observational evidence favoring the identification of the X-ray object as a black hole appears to be very strong. The structure of the binary system is examined on the basis of optical observations and X-ray absorption data, evidence suggesting the existence of two physically distinct states of Cyg X-1 is assessed, and radio observations of the system are briefly described. Several theoretical models of Cyg X-1 involving an accretion disk around a black hole are considered. The short-term variability of Cyg X-1 is investigated in detail, with attention given to observations of this variability, time profiles of X-ray intensities, characteristic time scales of the variations, a shot-noise model, power spectrum analyses, millisecond bursts, and the time variation over the hard X-ray range. It is suggested that the short-term variability is an important key to understanding the physical nature of the accretion disk.

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