X iv : a st ro - p h / 97 12 17 0 v 1 1 2 D ec 1 99 7 Thermal - viscous instabilities in the accretion disk of GRS 1915 + 105
نویسندگان
چکیده
We use data obtained with the PCA onboard RXTE to analyze the spectral variations of the black hole candidate and superluminal source GRS 1915+105. Our results suggest that despite the complicated structure of the X-ray light curve, all spectral changes observed in this source can be explained as a sudden disappearing of the inner part of the accretion disk around the compact object, followed by a slower re-filling of the emptied region. The duration of an event and the size of the disappearing region fit remarkably well the expected radius dependence of the viscous time scale for the radiation-pressure dominated region of an accretion disk.
منابع مشابه
ar X iv : a st ro - p h / 97 12 23 2 v 1 1 7 D ec 1 99 7 1 The viscous disk of GRS 1915 + 105
GRS 1915+105, one of the two known galactic microquasars, shows an extremely complex variability in the X-ray band, comparable to no other X-ray source in the sky. Making use of RXTE/PCA data, we have analyzed the X-ray spectral distribution throughout the variability. We find that all variations can be attributed to the rapid appearance and disappearance of the inner region of an optically-thi...
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Based on a spectral analysis of the X-ray continuum that employs a fully relativistic accretion-disk model, we conclude that the compact primary of the binary X-ray source GRS 1915+105 is a rapidly-rotating Kerr black hole. We find a lower limit on the dimensionless spin parameter of a∗ > 0.98. Our result is robust in the sense that it is independent of the details of the data analysis and inse...
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