Forced oscillations in magnetized accretion disks and QPOs

Details Forced oscillations in magnetized accretion disks and QPOs Forced oscillations in magnetized accretion disks and QPOs

2005-07-06

arxiv.org/abs/astro-ph/0507128v1

Astronomy and Astrophysics

Astrophysics

Accpeted by A&A

Scientific paper

10.1051/0004-6361:20041511

We propose a new model for these QPOs based on forced oscillations induced in the accretion disk due to the stellar magnetic field. First, it is shown that a magnetized accretion disk evolving in a rotating nonaxisymmetric magnetic field anchored to a neutron star will be subject to three kinds of resonances: a corotation resonance, a Lindblad resonance due to a driving force, and a parametric resonance due to the time varying epicyclic frequencies. In the second part of the paper, we focus on the linear response of a thin accretion disk, developing the density perturbation as the sum of free wave solutions and non-wavelike disturbances. In the last part, we show results of 2D numerical simulations of a simplified version of the accretion disk consisting of a column of plasma threaded by a vertical magnetic field. It is argued that the nearly periodic motion induced in the disk will produce high quality factor QPOs.

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