Rapid X-ray variability of the superluminal source GRS1915+105

Paul, B. ; Agrawal, P. C. ; Rao, A. R. (1997) Rapid X-ray variability of the superluminal source GRS1915+105 Astronomy & Astrophysics, 320 (2). L37-L40. ISSN 0004-6361

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The superluminal X-ray transient source GRS 1915+105 was observed during July 20-29, 1996 with the Indian X-ray Astronomy Experiment (IXAE) on the Indian satellite IRS-P3 launched on March 21, 1996 from Shriharikota Range in India. During our observations covering the energy band 2-18 keV, we have seen strong erratic intensity variations on time scale of 0.1s - 10s. Quasi Periodic Oscillations (QPOs) in a frequency range of 0.62 to 0.82 Hz were detected with a rms fraction of about 9%. The rapid X-ray intensity variations in GRS1915+105 are similar to those observed in some other black hole binaries and thus provide further support for the hypothesis that this source is likely to be a black hole. We discuss the possible emission region and mechanism of the observed quasi-periodic oscillations. Comparing the observed QPOs with the ones observed in other neutron star and black-hole systems, we argue that GRS1915+105 is possibly a black-hole.

Item Type:Article
Source:Copyright of this article belongs to EDP Sciences.
Keywords:Accretion; Accretion Disks; Black Hole Physics; X-rays: Stars-Stars: Individual; Grs 1915+105
ID Code:85452
Deposited On:02 Mar 2012 12:00
Last Modified:19 May 2016 01:29

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