A magnetic switch that determines the speed of astrophysical jets.

A magnetic switch that determines the speed of astrophysical jets.

The mechanism by which astrophysical jets form is an important factor in understanding the nature and evolution of phenomena such as active galactic nuclei and quasars, Galactic superluminal X-ray sources and young stellar objects. Of the many schemes proposed for jet production, only the magnetized...

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Main Authors: Meier, D., Edgington, S., Godon, P., Payne, D., Lind, K.
Format: Villanova Faculty Authorship
Language:English
Published: 1997
Online Access:http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:176408
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spelling A magnetic switch that determines the speed of astrophysical jets.
Meier, D.
Edgington, S.
Godon, P.
Payne, D.
Lind, K.
The mechanism by which astrophysical jets form is an important factor in understanding the nature and evolution of phenomena such as active galactic nuclei and quasars, Galactic superluminal X-ray sources and young stellar objects. Of the many schemes proposed for jet production, only the magnetized accretion disk model of Blandford and Payne1 seems to be applicable to all of these systems, and also offers the potential for generating the highly relativistic flows observed in some quasars2. But the source of variation in jet morphology observed for different sources remains unclear. Here we report time-dependent numerical simulations of jet formation which show that the character and speed of the jets produced depend dramatically on whether magnetic forces dominate over gravity in the accretion disk corona. This 'magnetic switch' is not predicted by steady-state, self-similar disk models, or by relativistic wind theory (which generally ignores the gravitational field). The effect provides a natural explanation for the existence of two known classes of extragalactic radio source and for the variation of their properties with radio luminosity. It also provides insight into protostellar and galactic microquasar systems.
1997
Villanova Faculty Authorship
vudl:176408
Nature 388, July 24, 1997.
en
dc.title_txt_mv A magnetic switch that determines the speed of astrophysical jets.
dc.creator_txt_mv Meier, D.
Edgington, S.
Godon, P.
Payne, D.
Lind, K.
dc.description_txt_mv The mechanism by which astrophysical jets form is an important factor in understanding the nature and evolution of phenomena such as active galactic nuclei and quasars, Galactic superluminal X-ray sources and young stellar objects. Of the many schemes proposed for jet production, only the magnetized accretion disk model of Blandford and Payne1 seems to be applicable to all of these systems, and also offers the potential for generating the highly relativistic flows observed in some quasars2. But the source of variation in jet morphology observed for different sources remains unclear. Here we report time-dependent numerical simulations of jet formation which show that the character and speed of the jets produced depend dramatically on whether magnetic forces dominate over gravity in the accretion disk corona. This 'magnetic switch' is not predicted by steady-state, self-similar disk models, or by relativistic wind theory (which generally ignores the gravitational field). The effect provides a natural explanation for the existence of two known classes of extragalactic radio source and for the variation of their properties with radio luminosity. It also provides insight into protostellar and galactic microquasar systems.
dc.date_txt_mv 1997
dc.format_txt_mv Villanova Faculty Authorship
dc.identifier_txt_mv vudl:176408
dc.source_txt_mv Nature 388, July 24, 1997.
dc.language_txt_mv en
author Meier, D.
Edgington, S.
Godon, P.
Payne, D.
Lind, K.
spellingShingle Meier, D.
Edgington, S.
Godon, P.
Payne, D.
Lind, K.
A magnetic switch that determines the speed of astrophysical jets.
author_facet Meier, D.
Edgington, S.
Godon, P.
Payne, D.
Lind, K.
dc_source_str_mv Nature 388, July 24, 1997.
format Villanova Faculty Authorship
author_sort Meier, D.
dc_date_str 1997
dc_title_str A magnetic switch that determines the speed of astrophysical jets.
description The mechanism by which astrophysical jets form is an important factor in understanding the nature and evolution of phenomena such as active galactic nuclei and quasars, Galactic superluminal X-ray sources and young stellar objects. Of the many schemes proposed for jet production, only the magnetized accretion disk model of Blandford and Payne1 seems to be applicable to all of these systems, and also offers the potential for generating the highly relativistic flows observed in some quasars2. But the source of variation in jet morphology observed for different sources remains unclear. Here we report time-dependent numerical simulations of jet formation which show that the character and speed of the jets produced depend dramatically on whether magnetic forces dominate over gravity in the accretion disk corona. This 'magnetic switch' is not predicted by steady-state, self-similar disk models, or by relativistic wind theory (which generally ignores the gravitational field). The effect provides a natural explanation for the existence of two known classes of extragalactic radio source and for the variation of their properties with radio luminosity. It also provides insight into protostellar and galactic microquasar systems.
title A magnetic switch that determines the speed of astrophysical jets.
title_full A magnetic switch that determines the speed of astrophysical jets.
title_fullStr A magnetic switch that determines the speed of astrophysical jets.
title_full_unstemmed A magnetic switch that determines the speed of astrophysical jets.
title_short A magnetic switch that determines the speed of astrophysical jets.
title_sort magnetic switch that determines the speed of astrophysical jets.
publishDate 1997
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language English
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