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MHD simulations of jet formation - protostellar jets & applications to AGN jets

Published online by Cambridge University Press:  24 February 2011

Christian Fendt ,
Bhargav Vaidya ,
Oliver Porth  and
Somayeh Sheikh Nezami
Christian Fendt
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: [email protected]
Bhargav Vaidya
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: [email protected]
Oliver Porth
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: [email protected]
Somayeh Sheikh Nezami
Affiliation:
Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany email: [email protected]
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Abstract

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Jet formation MHD simulations are presented considering a variety of model setups. The first approach investigates the interrelation between the disk magnetisation profile and jet collimation. Our results suggest (and quantify) that outflows launched from a very concentrated region at the inner disk tend to be weakly collimated. In the second approach, jet formation is investigated from a magnetic field configuration consisting of a stellar dipole superposed by a strong disk field. We find that the central dipole considerably de-collimates the disk wind. In addition, reconnection flares are launched in the interaction region of disk and stellar magnetic field, subsequently changing the outflow mass flux by factors of two. The time interval between flare ejection is about 1000 Keplerian periods - surprisingly similar to the observed time lag between jet knots. The third approach considers radiative pressure effects on jet collimation - an environment which is interesting mainly for outflows from massive young stars (but also for relativistic jets). Finally we present relativistic MHD simulations of jet formation from accretion disks extenting the previous non-relativistic approaches.

Keywords

accretionaccretion disksstars: magnetic fieldsstars: mass lossstars: windsoutflowsISM: Herbig-Haro objectsgalaxies: jets
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 383 - 391
Copyright
Copyright © International Astronomical Union 2011

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