Simulations of jet production in magnetized accretion disk coronae.

We describe the results of over 40 MHD simulations, performed on Caltech/JPL parallel supercomputers, of the coronae of magnetized accretion disks around compact objects. All produce some type of outflow from the disk. Our parameter study investigated the character of the outflow as a function of the strength of the initial poloidal magnetic field and its angle with respect to the disk rotation axis. When the radial component of the field is significant, this outflow takes the form of a collimated jet ejected from the center of the accretion disk. The jet velocity is a strong function of the strength of the initial magnetic field: for Alfv6n velocities (VA) below the escape speed (Vs.), the jet velocity is of order VA, but for VA only slightly above Vs., the jet velocity is an order of magnitude or more greater. This “magnetic switch” behaves similarly for a broad range of magnetic field polar angle. However, when the initial coronal magnetic field is nearly completely dominated by an axial component, the import ante of the central jet diminishes and the outflow becomes dominated by a poorly-collimated wind from a broader region of the accretion disk. The magnetic switch may have applications to galactic and extragalactic radio sources and other objects.

Main Author: Meier, David.
Other Authors: Edgington, Samantha., Godon, Patrick., Payne, David., Lind, Kevin.
Language: English
Published: 1997
Online Access: http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:176471
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dc_source_str_mv NASA--Jet Propulsion Laboratory, 10/17/1997.
author Meier, David.
author_facet_str_mv Meier, David.
Edgington, Samantha.
Godon, Patrick.
Payne, David.
Lind, Kevin.
author_or_contributor_facet_str_mv Meier, David.
Edgington, Samantha.
Godon, Patrick.
Payne, David.
Lind, Kevin.
author_s Meier, David.
spellingShingle Meier, David.
Simulations of jet production in magnetized accretion disk coronae.
author-letter Meier, David.
author_sort_str Meier, David.
author2 Edgington, Samantha.
Godon, Patrick.
Payne, David.
Lind, Kevin.
author2Str Edgington, Samantha.
Godon, Patrick.
Payne, David.
Lind, Kevin.
dc_title_str Simulations of jet production in magnetized accretion disk coronae.
title Simulations of jet production in magnetized accretion disk coronae.
title_short Simulations of jet production in magnetized accretion disk coronae.
title_full Simulations of jet production in magnetized accretion disk coronae.
title_fullStr Simulations of jet production in magnetized accretion disk coronae.
title_full_unstemmed Simulations of jet production in magnetized accretion disk coronae.
collection_title_sort_str simulations of jet production in magnetized accretion disk coronae.
title_sort simulations of jet production in magnetized accretion disk coronae.
description We describe the results of over 40 MHD simulations, performed on Caltech/JPL parallel supercomputers, of the coronae of magnetized accretion disks around compact objects. All produce some type of outflow from the disk. Our parameter study investigated the character of the outflow as a function of the strength of the initial poloidal magnetic field and its angle with respect to the disk rotation axis. When the radial component of the field is significant, this outflow takes the form of a collimated jet ejected from the center of the accretion disk. The jet velocity is a strong function of the strength of the initial magnetic field: for Alfv6n velocities (VA) below the escape speed (Vs.), the jet velocity is of order VA, but for VA only slightly above Vs., the jet velocity is an order of magnitude or more greater. This “magnetic switch” behaves similarly for a broad range of magnetic field polar angle. However, when the initial coronal magnetic field is nearly completely dominated by an axial component, the import ante of the central jet diminishes and the outflow becomes dominated by a poorly-collimated wind from a broader region of the accretion disk. The magnetic switch may have applications to galactic and extragalactic radio sources and other objects.
publishDate 1997
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dc_date_str 1997
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dc.title Simulations of jet production in magnetized accretion disk coronae.
dc.creator Meier, David.
Edgington, Samantha.
Godon, Patrick.
Payne, David.
Lind, Kevin.
dc.description We describe the results of over 40 MHD simulations, performed on Caltech/JPL parallel supercomputers, of the coronae of magnetized accretion disks around compact objects. All produce some type of outflow from the disk. Our parameter study investigated the character of the outflow as a function of the strength of the initial poloidal magnetic field and its angle with respect to the disk rotation axis. When the radial component of the field is significant, this outflow takes the form of a collimated jet ejected from the center of the accretion disk. The jet velocity is a strong function of the strength of the initial magnetic field: for Alfv6n velocities (VA) below the escape speed (Vs.), the jet velocity is of order VA, but for VA only slightly above Vs., the jet velocity is an order of magnitude or more greater. This “magnetic switch” behaves similarly for a broad range of magnetic field polar angle. However, when the initial coronal magnetic field is nearly completely dominated by an axial component, the import ante of the central jet diminishes and the outflow becomes dominated by a poorly-collimated wind from a broader region of the accretion disk. The magnetic switch may have applications to galactic and extragalactic radio sources and other objects.
dc.date 1997
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dc.source NASA--Jet Propulsion Laboratory, 10/17/1997.
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