Short-term X-ray variability of GX 339 - 4

Details Short-term X-ray variability of GX 339 - 4 Short-term X-ray variability of GX 339 - 4

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..712m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 712-720.

Astronomy and Astrophysics

Astronomy

64

Binary Stars, Black Holes (Astronomy), Satellite Observation, X Ray Sources, X Ray Stars, Light Curve, Variability, X Ray Astronomy

Scientific paper

A black hole candidate GX 339 - 4 (4U 1659 - 48) was observed in 1981 and 1982 with the X-ray astronomy satellite Hakucho for more than 50 days in total. In 1981 April and 1982 May, the source was in the X-ray off state (less than about 15 mCrab units), while the optical counterpart was also very faint. Through a substantial part of 1981 June, GX 339 - 4 was in a 0.1-0.2 Crab intensity state with a relatively hard spectrum. On this occasion, it exhibited a persistent, aperiodic intensity variation with about 35 percent rms amplitude on time scales of a fraction of a second to tens of seconds. In the 1-22 keV range, the characteristics of the fluctuation were independent of X-ray energy. In late June of 1981, the source made a transition into a much brighter (about 0.5 Crab intensity) state, with a significant spectral softening. After the transition, the short-term X-ray variation disappeared. The similarity between GX 339 - 4 and Cyg X-1 is discussed.

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