Open AccessOn the source of quasi‐periodic oscillations of the black hole candidate GRS 1915+105: some new observations and their interpretation
Author(s) -
Nandi Anuj,
Manickam Sivakumar G.,
Rao A. R.,
Chakrabarti Sandip K.
Publication year - 2001
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2001.04339.x
Subject(s) - physics , accretion (finance) , astrophysics , accretion disc , black hole (networking) , interpretation (philosophy) , oscillation (cell signaling) , astronomy , light curve , computer network , routing protocol , routing (electronic design automation) , biology , computer science , programming language , genetics , link state routing protocol
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.