Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..219m&link_type=abstract
(ESA, ESLAB Symposium on X-ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews
Astronomy and Astrophysics
Astronomy
48
Black Holes (Astronomy), Infrared Spectra, X Ray Sources, X Ray Spectra, Oscillations, Power Spectra, Stellar Mass Accretion
Scientific paper
Results of correlated IR, optical and X-ray observations of GX 339-4 made from March 1981 through May 1984 are reviewed. In the soft X-ray state the object does not show outstanding optical and X-ray variability. Night-to-night smooth optical variations of 0.3 magnitudes were, however present during one observing run. In contrast, the hard X-ray state is characterized by strong erratic optical and X-ray fluctuations on time scales from 20 milliseconds to seconds, as well as 7 to 20 second quasi-periodic oscillations. The optical counterpart appears much redder in the IR during the hard state. Particular attention is drawn to the hard to soft X-ray transition which occurred in June 1981. The shape of the IR to X-ray energy distribution is discussed. The unusual features of this 'black hole candidate' are examined in the framework of the current theories of accretion.
Angebault P.
Chevalier Clément
Ilovaisky Sergio A.
Motch Ch.
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