CONNECTION BETWEEN THE ACCRETION DISK AND SUPERLUMINAL RADIO JETS AND THE ROLE OF THE RADIO PLATEAU STATE IN GRS 1915+105

摘要

We investigate the association between the accretion disk during the radio plateau state and the following su-perluminal relativistic radio jets with peak intensity varying from 200 to 1000 mJy observed over a period of 5 yr and present evidence of a direct accretion disk-jet connection in the microquasar GRS 1915+105. We have analyzed RXTE PCA/HEXTE X-ray data and have found that the accretion rate, m_(accr), as inferred from the X-ray flux, is very high during the radio plateaux. We suggest that the accretion disk during the radio plateaux is always associated with radiation-driven wind, which is manifested in the form of enhanced absorption column density for X-rays and depleted IR emission. We find that the wind density increases with the accretion disk luminosity during the radio plateaux. The wind density is similar to the density of the warm absorber proposed in extragalactic active galactic nuclei (AGNs) and quasars. We suggest a simple model for the origin of superluminal relativistic jets. Finally, we discuss the implications of this work for Galactic microquasars and extragalactic AGNs and quasars.