Data Centre for Astrophysics
Astronomy Department of the University of Geneva
ISDC Seminar

27-SEP-2006, /!\ Seminar Cancelled at 11:00

J. S. Yadav
Tata Institute of Fundamental Research, Mumbai, India

Origin of superluminal jets in microquasar GRS 1915+105

Abstract. We discuss the origin of superluminal jets in microquasars and provide tight correlation between accretion disk and superluminal jet parameters. We find that the accretion rate during the very high luminosity state (VHS) like the plateau state in GRS 1915+105 is very high and suggest that the accretion disk during the plateaux is always associated with radiation-driven wind. The internal shock forms in the previously generated slowly moving wind (during plateau) with β ≤ 0.01 as the fast moving discrete jet (usually at the end of plateau) with β ~ 1 catches up and interacts with it. The power of superluminal jet is determined by the strength and speed of these two components; the slow moving wind and the fast moving jet which are related to the accretion disk during the plateau state. Finally, we discuss the implications of this work.

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