Disk-Jet Connection in the Microquasar GRS 1915+105 and IR and Radio Emission

Details Disk-Jet Connection in the Microquasar GRS 1915+105 and IR and Radio Emission Disk-Jet Connection in the Microquasar GRS 1915+105 and IR and Radio Emission

2000-10-14

arxiv.org/abs/astro-ph/0010280v1

Astronomy and Astrophysics

Astrophysics

7 pages + 5 figures, Accepted for publication in ApJ (Part 1), emulateapj style file

Scientific paper

10.1086/319032

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 dissipation of accretion energy in the inner part of the disk in terms of a comptonising cloud and the escaping mass which produces synchrotron radiation. We discuss the differences between ``baby jets'' and relativistic radio jets and especially investigate their signatures in X-rays. Our results support the relativistic jet model with quasi-continuous mass ejection and strong variations in the jet speeds required for the formation of strong internal shocks to continuously accelerate the particles.

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