Rossi X-Ray Timing Explorer Observations of GRS 1915+105

Details Rossi X-Ray Timing Explorer Observations of GRS 1915+105 Rossi X-Ray Timing Explorer Observations of GRS 1915+105

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473l.107g&link_type=abstract

Astrophysical Journal Letters v.473, p.L107

Astronomy and Astrophysics

Astronomy

135

X-Rays: Stars, Stars: Individual Alphanumeric: Grs 1915+105, Accretion, Accretion Disks, Instabilities

Scientific paper

The Galactic superluminal motion source GRS 1915+105 was observed with the Rossi X-Ray Timing Explorer satellite at several occasions during its ongoing active state. The observed X-ray intensity changes drastically on a variety of timescales ranging from subseconds to days. In particular, the source exhibits quasi-periodic brightness sputters with varying duration and repetition timescale. These episodes occur occasionally, while the more common X-ray intensity variations are faster with much smaller amplitudes. The spectrum during the brightness sputters is remarkably different from the spectrum of the mean high-state emission. We argue that such sputtering episodes are possibly caused by a major accretion disk instability. Based on the coincidence in time of two radio flares following the observed X-ray sputtering episodes, we speculate that superluminal ejections (as observed from GRS 1915+105 during earlier activity periods) are related to episodes of large-amplitude X-ray variations.

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