Oscillating shocks in the low angular momentum flows as a source of variability of accreting black holes
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.
Keywords
Cite
@article{arxiv.1411.7836,
title = {Oscillating shocks in the low angular momentum flows as a source of variability of accreting black holes},
author = {Petra Suková and Agnieszka Janiuk},
journal= {arXiv preprint arXiv:1411.7836},
year = {2015}
}
Comments
15 pages, 11 figures, 1 table; submitted to MNRAS