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Title:
Evolution of QPOs in XTE J1550-564 in 1998 outburst: a Case of Quasi Outburst?
Authors:
Dutta, Broja G.; Chakrabarti, Sandip K.; Pal, Partha S.
Affiliation:
AA(Indian Centre for Space Physics, Chalantika 43, Garia Station Rd., Kolkata, 700084, India; On leave from Y. S. Palpara College, Palpara Purba-Medinipur, 721458, India), AB(S. N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700098, India; Indian Centre for Space Physics, Chalantika 43, Garia Station Rd., Kolkata, 700084, India), AC(Indian Centre for Space Physics, Chalantika 43, Garia Station Rd., Kolkata, 700084, India)
Publication:
OBSERVATIONAL EVIDENCE FOR BLACK HOLES IN THE UNIVERSE: Proceedings of the 2nd Kolkata Conference on Observational Evidence for Black Holes in the Universe held in Kolkata India, 10-15 February 2008 and the Satellite Meeting on Black Holes, Neutron Stars, and Gamma-Ray Bursts held 16-17 February 2008. AIP Conference Proceedings, Volume 1053, pp. 165-170 (2008). (AIPC Homepage)
Publication Date:
10/2008
Origin:
AIP
PACS Keywords:
Galactic nuclei , circumnuclear matter, and bulges, Astronomical catalogs, atlases, sky surveys, databases, retrieval systems, archives, etc., Infall, accretion, and accretion disks, Macrosonic propagation, finite amplitude sound; shock waves
DOI:
10.1063/1.3009476
Bibliographic Code:
2008AIPC.1053..165D

Abstract

It is believed that Low and Intermediate frequency Quasi-Periodic Oscillations (QPOs) may be generated due to the oscillations of the post-shock region which Comptonizes soft photons. Any movement of these perturbations is expected to change the QPO frequency systematically. Here, we report the presence of such systematic drifts both during the onset phase from the 7th of September 1998 to the 19th September 1998, when the QPO frequency was increasing monotonically from 81mHz to 13.1Hz. It started to decrease at the onset of the decline phase. On the 26th of September 1998, the QPO frequency gradually decreased to 2.62Hz and after that its value remains almost stable and no such systematic drift was observed. We therefore model the frequency drift with a propagatory oscillating shock solution. The systematic and predictable variation of the QPO frequency over a period of few weeks directly supports the view that it may due to the drifting of an oscillating shock rather than the movements of a blob inside a differentially rotating disk.
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