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The Class 0 Outflow Hammered Out?

Published online by Cambridge University Press:  25 May 2016

Michael D. Smith ,
Roland Völker ,
Gerhard Suttner  and
Harold W. Yorke
Michael D. Smith
Affiliation:
Astronomisches Institut der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Roland Völker
Affiliation:
Astronomisches Institut der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Gerhard Suttner
Affiliation:
Astronomisches Institut der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Harold W. Yorke
Affiliation:
Astronomisches Institut der Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Abstract

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Dense molecular jets cutting through dense molecular clouds are simulated here using a ZEUS-type hydrodynamics code extended with molecular physics. H2 ‘hot snapshots’ and CO ‘historical views’ are nicely modelled with overdense uniform jets. Attention is drawn to some remaining hot problems: observed jet knots are bow shaped, bipolar outflows can be highly asymmetric, some proper motions within jets are enigmatically low and H2 excitation can be exceedingly uniform.

We present the Hammer Jet, in which the nozzle introduces high velocity variations, as well as a strong ripping and spray action. Prominent jet bow shocks in H2 and CO emission lines are then produced. Wide tubular CO structures with concave bases show up. Proper motions are simulated. The asymmetries are modelled by jet break-out from a molecular core into a diffuse atomic environment.

Type
III. Theoretical Models
Information
Symposium - International Astronomical Union , Volume 182: Herbig-Haro Flows and the Birth of Low Mass Stars , 1997 , pp. 303 - 312
Copyright
Copyright © Kluwer 1997 

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