Abstract
We considered the evolution of a self-gravitating clumpy torus in the gravitational field of the central mass of an active galactic nucleus (AGN) in the framework of the N-body problem. The initial conditions take into account winds with different opening angles. Results of our N-body simulations show that the clouds moving on orbits with a spread in inclinations and eccentricities form a toroidal region. The velocity of the clouds at the inner boundary of the torus is lower than in a disk model that can explain the observed rotation curves. We discuss the scenario of torus formation related with the beginning of the AGN stage.
Highlights
A dusty torus is an important structural element of an active galactic nucleus (AGN)
The distribution of clouds after 1, 000 orbital periods are shown in the bottom panels of Figure 1. (One orbital period corresponds T = 30, 000 years for MBH = 107M⊙ and R = 1 pc.) It is seen that the clouds are spread along zaxis as compared to the initial state, and that the cloud density increases towards the center of the torus cross-section
N-body simulations show that a torus like the one observed in NGC1068 can stay thick, if its clouds initially have a random distribution of the orbital elements and anisotropy in two polar directions
Summary
A dusty torus is an important structural element of an active galactic nucleus (AGN). ALMA observations allowed to estimate the mass of the torus in NGC 1068: Mtorus = 105M⊙ (García-Burillo et al, 2016) It means that self-gravity of the torus can influence the motion of the clouds in it. Our main idea is that the geometrical thickness of torus can be achieved by the motion of clouds in inclined orbits (Bannikova et al, 2012). This assumption is quite natural because there is the. We continue to investigate the properties and stability of a self-gravitating clumpy torus in the framework of N-body problem for more general initial conditions, taking into account the wind cones with different opening angles.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
