Detection of a Series of X-ray Dips Associated with a Radio Flare in GRS 1915+105

Abstract

We report the detection of a series of X-ray dips in the Galactic black hole candidate GRS 1915+105 during 1999 June 6-17 from observations carried out with the Pointed Proportional Counters of the Indian X-ray Astronomy Experiment on board the Indian satellite IRS-P3. The observations were made after the source made a transition from a steady low-hard state to a chaotic state which occuered within a few hours. Dips of about 20-160 seconds duration are observed on most of the days. The X-ray emission outside the dips shows a QPO at ~ 4 Hz which has characteristics similar to the ubiquitous 0.5 - 10 Hz QPO seen during the low-hard state of the source. During the onset of dips this QPO is absent and also the energy spectrum is soft and the variability is low compared to the non-dip periods. These features gradually re-appear as the dip recovers. The onset of the occurrence of a large number of such dips followed the start of a huge radio flare of strength 0.48 Jy (at 2.25 GHz). We interpret these dips as the cause for mass ejection due to the evacuation of matter from an accretion disk around the black hole. We propose that a super-position of a large number of such dip events produces a huge radio jet in GRS 1915+105.

18 pages, 7 figures, Accepted for publication in ApJ

References in corpus (3)

• AU-Scale Synchrotron Jets and Superluminal Ejecta in GRS 1915+105
• Mass Outflow Rate From Accretion Discs around Compact Objects
• Faint Infrared Flares from the Microquasar GRS 1915+105

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• Observational evidence for mass ejection during soft X-ray dips in GRS1915+105
• Disk-Jet Connection in the Microquasar GRS 1915+105 and IR and Radio Emission
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• Class Transitions and Two Component Accretion Flow in GRS 1915+105
• Fast Transition between High-soft and Low-soft States in GRS 1915+105: Evidence for a Critically Viscous Accretion Flow
• On the Ejection Mechanism of Bullets in SS 433
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