Disk‐Jet Connection in the Microquasar GRS 1915+105 and Infrared and Radio Emission

Abstract

We present evidence of a direct accretion disk-jet connection in the Galactic microquasar GRS 1915+105 based on our analysis of RXTE/PCA data with a "spike" in X-ray light curves. We find that the radio emission increases as the hardness ratio increases during the low hard state. We suggest that the "spike," which separates the dips with hard and soft spectra, marks the beginning of the burst phase when the luminosity of the soft X-rays (5-15 keV) increases by a large factor (~10). This produces a major ejection episode of the synchrotron-emitting plasma termed as "baby jets," which are associated with infrared (IR) and radio flares of about half an hour period widely reported in the literature. Subsequent short but frequent soft dips produce overlapping faint flares which result in an enhanced level of quasi-steady emission. We discuss the differences between "baby jets" and relativistic radio jets and especially investigate their signatures in X-rays.