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Herbig-Haro Objects as Searchlights for Dense Cloud Chemistry

Published online by Cambridge University Press:  25 May 2016

S. D. Taylor
S. D. Taylor*
Affiliation:
University College London, Gower St., London WC1E 6BT, England

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Stars form from dense pockets of gas that have undergone gravitational collapse, and young stars are still embedded in this molecular material. There is no lack of evidence that the outflows from these stars, manifested in the form of Herbig-Haro objects and jets, interact dynamically with the dense gas either in the form of shock excitation or the imparting of momentum; molecular outflows, H2 emission, and perhaps also CO and SiO bullets and jets, are tracers of this phenomenon. However there are a set of radio observations of molecules showing emission near HH objects that are remarkable for their apparent lack of signatures of such dynamic interaction. A likely cause of this ‘quiescent’ emission is a radiative interaction between the HH shock system emission and ambient gas.

Type
II. The Physics and Chemistry of Molecular Outflows
Information
Symposium - International Astronomical Union , Volume 182: Herbig-Haro Flows and the Birth of Low Mass Stars , 1997 , pp. 213 - 222
Copyright
Copyright © Kluwer 1997 

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