Abstract
view Abstract Citations (70) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Short-term X-ray variability of GX 339-4. Maejima, Y. ; Makishima, K. ; Matsuoka, M. ; Ogawara, Y. ; Oda, M. ; Tawara, Y. ; Doi, K. Abstract 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. Publication: The Astrophysical Journal Pub Date: October 1984 DOI: 10.1086/162549 Bibcode: 1984ApJ...285..712M Keywords: Binary Stars; Black Holes (Astronomy); Satellite Observation; X Ray Sources; X Ray Stars; Light Curve; Variability; X Ray Astronomy; Astrophysics full text sources ADS | data products SIMBAD (8)
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