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Title:
Live Coverage of Class Transitions in the Nano Quasar GRS 1915+105
Authors:
Choudhury, A. K.; Chatterjee, A. K.; Bari, W.; Chakrabarti, S. K.
Affiliation:
AA(Indian Centre for Space Physics, Malda Branch, Atul Market, Malda, India, 732101; L. M. S. M. High School, Malda, India, 732101), AB(Indian Centre for Space Physics, Malda Branch, Atul Market, Malda, India, 732101; Malda College, Malda, India, 732101), AC(Indian Centre for Space Physics, Malda Branch, Atul Market, Malda, India, 732101), AD(Indian Centre for Space Physics, Kolkata; S. N. Bose National Centre for Basic Sciences)
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. 161-164 (2008). (AIPC Homepage)
Publication Date:
10/2008
Origin:
AIP
PACS Keywords:
Galactic nuclei , circumnuclear matter, and bulges, Quasars, X-ray binaries, Binary and multiple stars
DOI:
10.1063/1.3009475
Bibliographic Code:
2008AIPC.1053..161C

Abstract

The micro quasar GRS 1915+105 exhibits at least 13 distinct classes of light curves. While RXTE satellite has pointed to this object about a thousand times, it has not been able to pinpoint exactly how and when a class transition actually takes place. We show that the Indian Satellite IXAE observed such class transitions several times. It is also observed that the QPO frequencies are changing during the transitions. Assuming that the transitions are caused by variations in the accretion rates, implies that a significant fraction of the matter must be nearly freely falling in order to have such transitions.
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