Paul, B. ; Agrawal, P. C. ; Rao, A. R. (1998) Low frequency quasi-periodic oscillations in the hard x-ray emission from cygnus x-1 Journal of Astrophysics and Astronomy, 19 (1-2). pp. 55-61. ISSN 0250-6335
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Abstract
The observations of the black hole binary Cygnus X-l were made in the energy band of 20-100keV with a balloon-borne Xenon-filled multiwire proportional counter telescope on 5th April 1992. Timing analysis of the data revealed the presence of Quasi-Periodic Oscillations (QPO) in the hard X-ray emission from the source. The QPO feature in the power density spectrum is broad with a peak at a frequency of 0.06 Hz. This result is compared with similar reports of QPOs in Cyg X-l in soft and hard X-rays. Short time scale random intensity variations in the X-ray light curve are described with a shot noise model.
| Item Type: | Article |
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| Source: | Copyright of this article belongs to Indian Academy of Sciences. |
| Keywords: | X-rays: Stars; Stars: Individual Cygnus Xl |
| ID Code: | 85604 |
| Deposited On: | 03 Mar 2012 14:48 |
| Last Modified: | 19 May 2016 01:34 |
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