28th Texas Symposium on Relativistic Astrophysics

Quasi-periodic oscillations of perturbed tori

16 Dec 2015, 15:42

3m

Level -1, Room 17 (International Conference Centre Geneva)

Poster 16 - Black holes

Speaker

Mr Varadarajan Parthasarathy (N. Copernicus Astronomical Center)

Description

Our research focuses on axisymmetric hydrodynamical simulations. The models implemented are *thinner* tori and *thicker* torus in equilibrium around a non-rotating black hole. The tori were constructed with a constant distribution of angular momentum obtained from Kluzniak-Lee (a pseudo-Newtonian) potential. Epicyclic motion were triggered by adding sub-sonic velocity fields; radial, vertical and diagonal. As the perturbed tori evolved in time, we measured $L_2$ norm of density and obtained the power spectrum which manifested modes as predicted by theory. Results from our simulations are relevant in the context of high-frequency quasi-periodic oscillations (HF QPOs) observed in stellar-mass black hole binaries.

Presentation materials

QPO_Texas15.pdf