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Session 48 - New Insights on X-ray Binaries - II.
Oral session, Wednesday, June 11
North Main Hall C/D,
The two superluminal jet sources GRS 1915+105 and GRO J1655-40 have been monitored with the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory. Both sources exhibit unusual intensity histories and spectra in the context of previously known X-ray transients. One of them, GRO J1655-40, is a proven black hole candidate with a low mass stellar companion, and has an accretion disk viewed nearly edge on from Earth. The other, GRS 1915+105, at times, is the most luminous hard X-ray source in the Galaxy and has an outburst history extending over 4 years. We assess properties of these objects as seen in BATSE data, and also examine the radio data obtained with the Very Large Array, Nancay and Green Bank radio telescopes for related X-ray/gamma ray and radio behavior. Clear evidence of correlated and anti-correlated behavior is found on day-weeks timescales in both sources. Occasionally, a high energy outburst is associated with the formation of radio jets. We discuss these observations in the context of accretion models which incorporate, at least to a limited extent, jet formation.
