Origin of Superluminal radio jets in GRS 1915+105 and the role of the Plateau state

Abstract

We have studied the accretion disk during the radio plateau state and the following superluminal relativistic radio jets and have provided a tight correlation between accretion disk and superluminal jet parameters. We find that accretion rate during the plateaux is very high and suggest that the accretion disk during the radio plateaux is always associated with radiation-driven wind. The internal shock forms in the previously generated slowly moving wind (during plateau) with $β$ $\le$ 0.01 as the fast moving discrete jet (usually at the end of plateau) with $β$ $\sim$ 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 implication of this work.