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Robert M. Hjellming (National Radio Astronomy Observatory)
Many X-ray transients and binaries have radio events which are related to state changes in the X-ray accretion environment. Models for these radio events have been fit to the radio light curve data for the X-ray transients GRO J1655-40 (1994 and 1996 events), GRS 1915+105, XTE J1748-288, 4U1630-47, XTE J2012+38, GRS 1739-278, XTE J0421+560 (CI Cam), XTE 1806-246, Cen X-4, A0620-00, GS2000+25, XRN Muscae 1991, V404 Cyg, Cyg X-3, and GRO J0422+32. Most of these events are fit by models for the ejection of jets for a finite period of time; however, in some cases expanding spherical "bubble" or "torus" models of relativistic plasma provide the best fits to the data. For the cases where images of the expanding radio emission have been obtained, the light curve fitting confirms the general characteristics of the models used for the radio light curve events. With the results for a large number of transients events some general conclusions about the ejections of jets and others forms of relativistic plasma are possible.
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