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- W101996883 abstract "We report on unprecedented short-term variations detected in the optical flux from the black hole binary system, V4641 Sgr. The amplitudes of the optical fluctuations were larger at longer time scales, and surprisingly reached |$ sim 60%$| around a period of |$ sim10 ,mathrm{min}$|. The power spectra of the fluctuations are characterized by a power law (|$ propto f^{-alpha},; alpha sim-1.7$|). It is the first case for black hole binaries that the optical emission was revealed to show short-term and large-amplitude variations given by such a power spectrum. The optical emission from black hole binaries is generally dominated by the emission from the outer portion of an accretion disc. The rapid optical fluctuations, however, indicate that the emission from an inner accretion region significantly contributes to the optical flux. In this case, cyclo-synchrotron emission associated with various scales of magnetic flares is the most promising mechanism for the violently variable optical emission." @default.
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- W101996883 date "2002-10-25" @default.
- W101996883 modified "2023-09-23" @default.
- W101996883 title "Rapid Optical Fluctuations in the Black Hole Binary V4641 Sagittarii" @default.
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- W101996883 doi "https://doi.org/10.1093/pasj/54.5.l79" @default.
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