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Black hole magnetosphere with small-scale flux tubes - II. Stability and dynamics

Author(s): Yuan, Yajie; Spitkovsky, Anatoly; Blandford, Roger D; Wilkins, Dan R

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Abstract: In some Seyfert galaxies, the hard X-rays that produce fluorescent emission lines are thought to be generated in a hot corona that is compact and located at only a few gravitational radii above the supermassive black hole. We consider the possibility that this X-ray source maybe powered by small-scale magnetic flux tubes attached to the accretion disc near the black hole. We use three-dimensional, time-dependent, special relativistic, force-free simulations in a simplified setting to study the dynamics of such flux tubes as they get continuously twisted by the central compact star/black hole. We find that the dynamical evolution of the flux tubes connecting the central compact object and the accretion disc is strongly influenced by the confinement of the surrounding field. Although differential rotation between the central object and the disc tends to inflate the flux tubes, strong confinement from surrounding field quenches the formation of a jet-like outflow, as the inflated flux tube becomes kink unstable and dissipates most of the extracted rotational energy relatively close to the central object.Such a process may be able to heat up the plasma and produce strong X-ray emission. We estimate the energy dissipation rate and discuss its astrophysical implications.
Publication Date: 10-Jun-2019
Electronic Publication Date: Aug-2019
Citation: Yuan, Yajie, Spitkovsky, Anatoly, Blandford, Roger D, Wilkins, Dan R. (2019). Black hole magnetosphere with small-scale flux tubes - II. Stability and dynamics. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 487 (3), 4114 - 4127. doi:10.1093/mnras/stz1599
DOI: doi:10.1093/mnras/stz1599
ISSN: 0035-8711
EISSN: 1365-2966
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Pages: 4114 - 4127
Type of Material: Journal Article
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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