Oscillating shocks in the low angular momentum flows as a source of variability of accreting black holes
arXiv:1411.7836 · doi:10.1093/mnras/stu2544
Abstract
We derive the conditions for shock formation in a quasi-spherical, slightly rotating flows. We verify the results of semi-analytical, stationary calculations with the time evolution studied by numerical hydro-simulations, and we study the oscillations of the shock position. We also study the behaviour of flows with varying specific angular momentum, where the 'hysteresis' type of loop is found when passing through the multiple sonic points region. Our results are in agreement with the timescales and shapes of the luminosity flares observed in Sgr A*. These models may also be applicable for the Galactic stellar mass black holes, like GX 339-4 or GRS 1915+105, where periodic oscillations of X-ray luminosity are detected.
15 pages, 11 figures, 1 table; submitted to MNRAS
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- A non-linear mathematical model for the X-ray variability classes of the microquasar GRS 1915+105 -- I: quiescent, spiking states and QPOs
- On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow