Hard X-ray Variability of GRO J1655-40 Observed by RXTE

Details Hard X-ray Variability of GRO J1655-40 Observed by RXTE Hard X-ray Variability of GRO J1655-40 Observed by RXTE

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19311201r&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #112.01; Bulletin of the American Astronomical Society, Vol. 30, p.1420

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Scientific paper

The 1996-1997 outbursts of the microquasar GRO J1655-40 were monitored by the Rossi X-ray Timing Explorer (RXTE) in a series of 80 pointed observations. During this time, both the Very High and High/Soft emission states were observed. In 1997 the High/Soft state hard x-ray flux (>20 keV) vanished on at least 5 occasions with an ~ 20 day timescale between disappearances. One prolonged disappearance was seen to last 30 days, while the others recovered within ~ 10 days. Compton up-scattering of soft x-rays from the inner accretion disk by a hot corona is believed to be the origin of the hard x-ray flux. The observed hard x-ray variability suggests recurrent loss of the corona.

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