Discovery of fast optical activity in the X-ray source GX 339-4

Details Discovery of fast optical activity in the X-ray source GX 339-4 Discovery of fast optical activity in the X-ray source GX 339-4

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...109l...1m&link_type=abstract

Astronomy and Astrophysics, vol. 109, no. 1, May 1982, p. L1-L4.

Astronomy and Astrophysics

Astronomy

60

Astronomical Photometry, Time Response, X Ray Sources, Flares, Radiant Flux Density, X Ray Astronomy

Scientific paper

The paper presents the first results of fast optical photometry of the GX 339-4 counterpart obtained in late May 1981 when the object was found in an unusually bright state (V=15.4). The optical flux displays 20 second quasi-oscillations of 30-40% full amplitude together with very short time scale activity. Flares as short as 10-20 milliseconds are observed, during which the flux can be increased by a factor up to 5. The overall optical time behavior is shown to be very similar to the X-ray time behaviour of Cyg X-1. Optical flares are likely to come from the hot inner part of the accretion disc. Possible interpretations of the 20 second quasi-oscillations are discussed.

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