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EVIDENCE OF VARIATION OF THE ACCRETION FLOW GEOMETRY IN GRS 1915 + 105 FROM IXAE AND RXTE DATA

PARTHA SARATHI PAL

Indian Centre for Space Physics, 43 Chalantika, Garia Station Rd., Kolkata 700084, India

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SANDIP K. CHAKRABARTI

Indian Centre for Space Physics, 43 Chalantika, Garia Station Rd., Kolkata 700084, India

S.N. Bose National Centre for Basic Sciences, JD Block, Salt Lake, Kolkata 700098, India

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ANUJ NANDI

Indian Centre for Space Physics, 43 Chalantika, Garia Station Rd., Kolkata 700084, India

Space Astronomy Group, ISRO Satellite Centre, Old Airport Rd., Bangalore 560017, India

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https://doi.org/10.1142/S0218271811020329Cited by:6 (Source: Crossref)

Abstract

The Galactic microquasar GRS 1915 + 105 exhibits various types of light curves. There is, however, no understanding of when a certain type of light curve will be exhibited and only in a handful of cases, the transitions from one type to another have actually been observed. We study the detailed spectral properties in these cases to show that different classes have different ratio of the power-law photon and the blackbody photon. Since the power-law photons are from the Compton cloud, and the intensity of the power-law photon component depends on the degree of interception of the soft photons by the Compton cloud, we conclude that not only the accretion rate, but the accretion flow geometry must also change during a class transition.

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