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• W2318602713 abstract "Low- and intermediate-frequency quasi-periodic oscillations (QPOs) in black hole candidates are believed to be due to oscillations of the Comptonizing regions in an accretion flow. Assuming that the general structure of an accretion disc is a two-component advective flow (TCAF), we numerically simulate the light curves emitted from an accretion disc for different accretion rates and find how the QPO frequencies vary. We use a standard Keplerian disc residing at the equatorial plane as a source of soft photons. These soft photons, after suffering multiple scattering with the hot electrons of the low angular momentum, sub-Keplerian, flow emerge out as hard radiation. The hydrodynamic and thermal properties of the electron cloud is simulated using a total variation diminishing (tvd) code. The tvd code is then coupled with a radiative transfer code which simulates the energy exchange between the electron and radiation using Monte Carlo technique. The resulting localized heating and cooling are included also. We find that the QPO frequency increases and the spectrum becomes softer as we increase the Keplerian disc rate. However, the spectrum becomes harder if we increase the sub-Keplerian accretion rate. We find that an earlier prediction that QPOs occur when the infall time-scale roughly matches with the cooling time-scale, originally obtained using a power-law cooling, remains valid even for Compton cooling. Our findings agree with the general observations of low-frequency QPOs in black hole candidates." @default.
• W2318602713 created "2016-06-24" @default.
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• W2318602713 date "2013-11-14" @default.
• W2318602713 modified "2023-10-16" @default.
• W2318602713 title "Quasi-periodic oscillations in a radiative transonic flow: results of a coupled Monte Carlo–tvd simulation" @default.
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• W2318602713 doi "https://doi.org/10.1093/mnras/stt1969" @default.
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