Sriram, K. ; Agrawal, V. K. ; Pendharkar, Jayant K. ; Rao, A. R. (2007) Anticorrelated hard X-ray time lags in galactic black hole sources The Astrophysical Journal, 661 (2). pp. 1055-1063. ISSN 0004-637X
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Official URL: http://iopscience.iop.org/0004-637X/661/2/1055
Related URL: http://dx.doi.org/10.1086/516771
Abstract
We investigate the accretion disk geometry in Galactic black hole sources by measuring the time delay between soft and hard X-ray emissions. Similar to the recent discoveries of anticorrelated hard X-ray time lags in Cygnus X-3 and GRS 1915+105, we find that the hard X-rays are anticorrelated with soft X-rays with a significant lag in another source, XTE J1550-564. We also find the existence of pivoting in the model-independent X-ray spectrum during these observations. We investigate time-resolved X-ray spectral parameters and find that the variation in these parameters is consistent with the idea of a truncated accretion disk. The QPO frequency, which is a measure of the size of truncated accretion disks, also changes, indicating that the geometric size of the hard X-ray emitting region changes along with the spectral pivoting and soft X-ray flux. A similar kind of delay is also noticed in 4U 1630-47.
Item Type: | Article |
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Source: | Copyright of this article belongs to University of Chicago Press. |
ID Code: | 85569 |
Deposited On: | 03 Mar 2012 14:51 |
Last Modified: | 03 Mar 2012 14:51 |
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