Long-Term Temporal Studies of GX339-4 Hard X-Ray Outbursts

Details Long-Term Temporal Studies of GX339-4 Hard X-Ray Outbursts Long-Term Temporal Studies of GX339-4 Hard X-Ray Outbursts

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0709h&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #07.09; Bulletin of the American Astronomical Society, Vol. 25, p.803

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Scientific paper

Hard x-ray emission (20-320 keV) from the black hole candidate GX339-4 was studied using the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO). The source was monitored on a daily basis during 120-day hard state outbursts in 1991 and 1992 using Earth occultation measurements of its energy spectrum and power density spectra of time-binned data (frequency range 0.005-0.5 Hz). We find considerable spectral evolution during the outbursts similar to other black hole candidates and at least two days where quasi-periodic oscillations are present in the power spectrum at 0.027 Hz (37 s). We examine the long-term behavior of the photon spectra of GX339-4 and integrated power spectra for possible correlations.

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