13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

Quasi-periodic oscillations from relativistic hydrodynamical slender tori

17 Dec 2015, 15:00
3m
Level 0, Room 23 (International Conference Centre Geneva)

Level 0, Room 23

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva

Speakers

Antonis Manousakis Bhupendra Mishra (Nicolaus Copernicus Astronomical Center Warsaw Poland) Frederic Vincent (Observatoire de Paris)

Description

We simulate a purely hydrodynamical torus with constant specific angular momentum around a Schwarzschild black hole. The goal is to search for quasi-periodic oscillations (QPOs) of the torus. Initial torus setup is subjected to radial, vertical and a diagonal (combination of radial and vertical) velocity perturbations. The hydrodynamical simulations are performed using the general relativistic magnetohydrodynamics code Cosmos++ and ray-traced using the GYOTO code. We found that exciting radial perturbations also trigger a plus mode, while vertical perturbations trigger an X-mode. The diagonal perturbation gives just a combination of radial and vertical perturbation. Existing radially perturbed hydrodynamic simulations are in full agreement with our findings. The behavior of QPOs in slender torus mimics those of non-slender torus. This confirms that in actual astrophysical accretion disks, no matter the model (thin, slim, thick), the QPOs will always be detected.

Primary author

Bhupendra Mishra (Nicolaus Copernicus Astronomical Center Warsaw Poland)

Co-authors

Presentation Materials