Sriram, K. ; Agrawal, V. K. ; Rao, A. R. (2009) Energy-dependent time lags in the Seyfert 1 galaxy NGC 4593 The Astrophysical Journal, 700 (2). pp. 1042-1046. ISSN 0004-637X
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Official URL: http://iopscience.iop.org/0004-637X/700/2/1042
Related URL: http://dx.doi.org/10.1088/0004-637X/700/2/1042
Abstract
We investigate the energy-time lag dependence of the source NGC 4593 using XMM-Newton/EPIC pn data. We found that the time lag dependency is linear in nature with respect to the logarithm of different energy bands. We also investigate the frequency-dependent time lags and identify that at some frequency range (5 x 10-5 Hz to 2 x 10-4 Hz) the X-ray emission is highly coherent, mildly frequency dependent, and very strongly energy dependent. These observations can be explained in the framework of the thermal Comptonization process, and they indicate a truncated accretion disk very close to the black hole. We discuss the plausible spectral state to explain the phenomenon and conclude that the observed properties bear a close resemblance to the intermediate state or the steep power-law state, found in galactic black hole sources.
Item Type: | Article |
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Source: | Copyright of this article belongs to University of Chicago Press. |
Keywords: | Accretion; Accretion Disks; Black Hole Physics; Galaxies: Individual (NGC 4593); Galaxies: Seyfert |
ID Code: | 85599 |
Deposited On: | 03 Mar 2012 14:53 |
Last Modified: | 19 May 2016 01:34 |
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