Faint Infrared Flares from the Microquasar GRS 1915+105

Details Faint Infrared Flares from the Microquasar GRS 1915+105 Faint Infrared Flares from the Microquasar GRS 1915+105

2000-01-27

arxiv.org/abs/astro-ph/0001472v1

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures Accepted for publication in ApJ Letters

Scientific paper

10.1086/312559

We present simultaneous infrared and X-ray observations of the Galactic microquasar GRS 1915+105 using the Palomar 5-m telescope and Rossi X-ray Timing Explorer on July 10, 1998 UT. Over the course of 5 hours, we observed 6 faint infrared (IR) flares with peak amplitudes of $\sim 0.3-0.6 $ mJy and durations of $\sim 500-600 $ seconds. These flares are associated with X-ray soft-dip/soft-flare cycles, as opposed to the brighter IR flares associated with X-ray hard-dip/soft-flare cycles seen in August 1997 by Eikenberry et al. (1998). Interestingly, the IR flares begin {\it before} the X-ray oscillations, implying an ``outside-in'' origin of the IR/X-ray cycle. We also show that the quasi-steady IR excess in August 1997 is due to the pile-up of similar faint flares. We discuss the implications of this flaring behavior for understanding jet formation in microquasars.

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