On the source of quasi-periodic oscillations of the black hole candidate GRS 1915+105: some new observations and their interpretation |
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| Authors: | Anuj Nandi Sivakumar G Manickam A R Rao Sandip K Chakrabarti |
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| Institution: | S. N. Bose National Centre for Basic Sciences, JD-Block, Sector III, Salt Lake, Calcutta 700098, India; Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India; Centre for Space Physics, 114/v/1A Raja S. C. Mullick Rd, Calcutta 700047, India |
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| Abstract: | A few classes of the light curve of the black hole candidate GRS 1915+105 have been analysed in detail. We discover that unlike the previous findings, quasi-periodic oscillations (QPOs) occasionally occur even in the so-called 'On' or softer states. Such findings may require a revision of the accretion/wind scenario of the black hole candidates. We conjecture that considerable winds that are produced in 'Off' states cool down as a result of Comptonization and fall back to the disc, creating an excess accretion rate and producing the so-called 'On' state. After the drainage of the excess matter, the disc goes back to the 'Off' state. Our findings strengthen the shock oscillation model for QPOs. |
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| Keywords: | accretion accretion discs black hole physics stars: individual: GRS 1915+105 stars: oscillations |
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