Accretion-Ejection Instability in magnetized disks: Feeding the corona with Alfvén waves

We present a detailed calculation of the mechanism by which the Accretion-Ejection Instability can extract accretion energy and angular momentum from a magnetized disk, and redirect them to its corona. In a disk threaded by a poloidal magnetic field of the order of equipartition with the gas pressur...

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Veröffentlicht in:	Astronomy and astrophysics (Berlin) 2002-10, Vol.394 (1), p.329-338
Hauptverfasser:	Varnière, P., Tagger, M.
Format:	Artikel
Sprache:	eng
Schlagworte:	accretion accretion disks Astrophysics Cosmology and Extra-Galactic Astrophysics galaxies: jets instabilities MHD Physics Sciences of the Universe waves
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container_title	Astronomy and astrophysics (Berlin)
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creator	Varnière, P. Tagger, M.
description	We present a detailed calculation of the mechanism by which the Accretion-Ejection Instability can extract accretion energy and angular momentum from a magnetized disk, and redirect them to its corona. In a disk threaded by a poloidal magnetic field of the order of equipartition with the gas pressure, the instability is composed of a spiral wave (analogous to galactic ones) and a Rossby vortex. The mechanism detailed here describes how the vortex, twisting the footpoints of field lines threading the disk, generates Alfvén waves propagating to the corona. We find that this is a very efficient mechanism, providing to the corona (where it could feed a jet or a wind) a substantial fraction of the accretion energy.
doi_str_mv	10.1051/0004-6361:20021135
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source	Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; EDP Sciences
subjects	accretion accretion disks Astrophysics Cosmology and Extra-Galactic Astrophysics galaxies: jets instabilities MHD Physics Sciences of the Universe waves
title	Accretion-Ejection Instability in magnetized disks: Feeding the corona with Alfvén waves
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