Simultaneous X-ray/optical observations of GX339-4 during the May 1981 optically bright state

Details Simultaneous X-ray/optical observations of GX339-4 during the May 1981 optically bright state Simultaneous X-ray/optical observations of GX339-4 during the May 1981 optically bright state

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...119..171m&link_type=abstract

Astronomy and Astrophysics, vol. 119, no. 2, Mar. 1983, p. 171-176. Research supported by the Science and Engineering Research

Astronomy and Astrophysics

Astronomy

89

Binary Stars, Stellar Flares, Stellar Spectrophotometry, Visual Photometry, X Ray Sources, Ariel Satellites, Astronomical Spectroscopy, Black Holes (Astronomy), Cross Correlation, Data Processing, Periodic Variations, Power Spectra, Radiant Flux Density, Temporal Distribution, X Ray Spectra

Scientific paper

Ariel 6 observations of GX 339-4 during the May 1981 optically bright state reveal the presence in X-rays of the 20-s quasi-periodic oscillation found in the optical range as well as a strong 10-s harmonic quasi-oscillation. The observed X-ray spectrum is the hardest reported for this bimodal source up to now. A 96-s simultaneous observation on May 28 reveals that variations on time scales longer than about 15 s are anticorrelated with the optical leading the X-rays by 2.8 + or -1.6 s. Shorter time scale variations do not appear to be correlated with the exception of X-ray flares which occur simultaneously with optical dips. The 13-20 keV range is found to have a statistically different behavior, suggesting that part of the high energy X-rays is positively correlated with the optical. Most of the behavior of GX 339-4 can be understood within the framework of the models developed for Cyg X-1 describing the inner accretion flow onto a black hole.

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