Dynamics of an ensemble of clumps embedded in a magnetized ADAF

Abstract

We investigate effects of a global magnetic field on the dynamics of an ensemble of clumps within a magnetized advection-dominated accretion flow by neglecting interactions between the clumps and then solving the collisionless Boltzman equation. In the strongcoupling limit, in which the averaged radial and the rotational velocities of the clumps follow the ADAF dynamics, the averaged radial velocity square of the clumps is calculated analytically for different magnetic field configurations. The value of the averaged radial velocity square of the clumps increases with increasing the strength of the radial or vertical components of the magnetic field. But a purely toroidal magnetic field geometry leads to a reduction of the value of the averaged radial velocity square of the clumps at the inner parts with increasing the strength of this component. Moreover, dynamics of the clumps strongly depends on the amount of the advected energy so that the value of the averaged radial velocity square of the clumps increases in the presence of a global magnetic field as the flow becomes more advective.

Multiphase environment of compact galactic nuclei: the role of the nuclear star cluster

“…The mechanism of cooling and heating of the interstellar medium (ISM) has been the object of detailed studies for some time (Dyson & Williams 1980;Kennicutt et al 1998). The microscopic processes that govern the gas dynamics are well understood, but nevertheless we still lack a detailed understanding of the chemical composition of the dusty plasma and of the energy input from stars.…”