Shocks in the relativistic transonic accretion with low angular momentum

0484764 - ASÚ 2018 RIV GB eng J - Journal Article
Suková, Petra - Charzynski, S. - Janiuk, A.
Shocks in the relativistic transonic accretion with low angular momentum.
Monthly Notices of the Royal Astronomical Society. Roč. 472, č. 4 (2017), s. 4327-4342. ISSN 0035-8711. E-ISSN 1365-2966
R&D Projects: GA ČR(CZ) GJ17-06962Y
Institutional support: RVO:67985815
Keywords : accretion discs * hydrodynamics * shock waves
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.194, year: 2017

We perform 1D/2D/3D relativistic hydrodynamical simulations of accretion flows with low angular momentum, filling the gap between spherically symmetric Bondi accretion and disc-like accretion flows. Scenarios with different directional distributions of angular momentum of falling matter and varying values of key parameters such as spin of central black hole, energy and angular momentum of matter are considered. In some of the scenarios the shock front is formed. We identify ranges of parameters for which the shock after formation moves towards or outwards the central black hole or the long-lasting oscillating shock is observed. The frequencies of oscillations of shock positions which can cause flaring in mass accretion rate are extracted. The results are scalable with mass of central black hole and can be compared to the quasi-periodic oscillations of selected microquasars (such as GRS 1915+105, XTE J1550-564 or IGR J17091-3624), as well as to the supermassive black holes in the centres of weakly active galaxies, such as Sgr A*.
Permanent Link: http://hdl.handle.net/11104/0279908