6533b7dafe1ef96bd126d97c
RESEARCH PRODUCT
On the dynamics of tilted black hole-torus systems
Nikolaos StergioulasFilippo GaleazziVassilios MewesPedro J. MonteroJosé A. Fontsubject
High Energy Astrophysical Phenomena (astro-ph.HE)Physics010308 nuclear & particles physicsAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstronomy and AstrophysicsTorusGeneral Relativity and Quantum Cosmology (gr-qc)Astrophysics01 natural sciencesGeneral Relativity and Quantum CosmologyAccretion (astrophysics)Black starNumerical relativityNeutron starComplex dynamicsSpace and Planetary Science0103 physical sciencesStellar black holeAstrophysics - High Energy Astrophysical PhenomenaLow Mass010303 astronomy & astrophysicsdescription
We present results from three-dimensional, numerical relativity simulations of a {\it tilted} black hole-thick accretion disc system. The simulations are analysed using tracer particles in the disc which are advected with the flow. Such tracers, which we employ in these new simulations for the first time, provide a powerful means to analyse in detail the complex dynamics of tilted black hole-torus systems. We show how its use helps to gain insight in the overall dynamics of the system, discussing the origin of the observed black hole precession and the development of a global non-axisymmetric $m=1$ mode in the disc. Our three-dimensional simulations show the presence of quasi-periodic oscillations (QPOs) in the instantaneous accretion rate, with frequencies in a range compatible with those observed in low mass X-ray binaries with either a black hole or a neutron star component. The frequency ratio of the dominant low frequency peak and the first overtone is $o_1/f \sim 1.9$, a frequency ratio not attainable when modelling the QPOs as $p$-mode oscillations in axisymmetric tori.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-05-09 |