Role of shocked accretion flows in regulating the QPO of galactic black hole candidates

Abstract

Using a generalized non-spherical, multi-transonic accretion flow model, we analytically calculate the normalized QPO frequency ${\bar{\nu }}_{qpo}$ of galactic black hole candidates in terms of dynamical flow variables and self-consistently study the dependence of ${\bar{\nu }}_{qpo}$ on such variables. Our results are in fairly close agreement with the observed QPO frequencies of GRS 1915+105. We find that ${\bar{\nu }}_{qpo}$ is quite sensitive to various parameters describing the black hole accretion flow containing dissipative and non-dissipative shock waves. Thus the QPO phenomena is, {\it indeed}, regulated by `shocked' black hole accretion, and, for the first time, we establish a definitive connection between the QPO frequency and the properties of advective BH accretion flows. This information may provide the explanation of some important observations of galactic micro quasars.

Final version accepted for publication in the Astrophysical Journal Letters (ApJL). A considerable part of the paper is almost completely re-written, though the results and the final conclussions are the same. One can now ignore the previous version. 8 pages with four black and white figures. For high resolution Fig. 3, please mail the author <[email protected]>

References in corpus (2)

• Two Different Long-term Behaviors in Black-Hole Candidates: Evidence for Two Accretion Flows?
• Generalized Shock Solutions for Hydrodynamic Black Hole Accretion

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• Hysteresis effects and diagnostics of the shock formation in low angular momentum axisymmetric accretion in the Kerr metric
• Shock oscillation model for QPOs in stellar-mass and supermassive black holes
• Chaotic and stochastic processes in the accretion flows of the black hole X-ray binaries revealed by recurrence analysis
• Radiative Shocks in Rotating Accretion Flows around Black Holes
• Behaviour of matter close to the event horizon
• QPO frequencies and mass-outflow rates in black hole powered galactic microquasars
• Modeling the time-resolved quasi-periodic oscillations in AGNs
• Viscosity parameter in dissipative accretion flows with mass outflow around black holes
• Multi-transonic spherical-type flows around massive black holes: galactic potential induced standing isothermal shocks