Low frequency quasi-periodic oscillations in the hard X-ray emission from Cygnus X-1

Paul, B. ; Agrawal, P. C. ; Rao, A. R. (2000) Low frequency quasi-periodic oscillations in the hard X-ray emission from Cygnus X-1 Advances in Space Research, 25 (3-4). pp. 429-432. ISSN 0273-1177

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0273-1177(99)00773-5

Abstract

The black-hole candidate Cyg X-1 was observed in a balloon flight experiment with large area Xenon-filled Multi-layer Proportional Counter (XMPC) telescope on April 5, 1992. The XMPC telescope sensitive in 20–100 keV range, observed Cyg X-1 in its hard state with an average counting rate of 51 counts per second for about 140 minutes. The timing analysis of the data show presence of Quasi-Periodic Oscillations (QPOs) in hard x-ray emission from the source. A broad QPO feature is seen clearly at a frequency of 0.06 Hz in the power density spectrum. Details of the results are presented and compared with reports of similar QPOs observed in Cyg X-1. The x-ray light curve also shows short time scale random intensity variations which are described by a shot noise model.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:95619
Deposited On:16 Nov 2012 12:58
Last Modified:16 Nov 2012 12:58

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