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Observational Properties of Molecular Outflows

Published online by Cambridge University Press:  25 May 2016

Rachael Padman ,
Stephen Bence  and
John Richer
Rachael Padman
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Rd., Cambridge, CB3 0HE, ENGLAND
Stephen Bence
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Rd., Cambridge, CB3 0HE, ENGLAND
John Richer
Affiliation:
Mullard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Rd., Cambridge, CB3 0HE, ENGLAND

Abstract

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Molecular outflows are intimately related to the highly collimated Herbig–Haro jets emanating from young stars. In consequence, the usual dynamical timescale significantly underestimates the true age of an outflow. If we correct for this factor, and assume an intrinsic outflow speed similar to that of the underlying jet, we predict that molecular outflows should have an overall extent of several parsecs, in accordance with recent results. It seems likely therefore that outflows are a major source of interstellar turbulence, and have a profound impact on the process of star formation.

Whilst interpretation of jet-like outflows is relatively straightforward, the origins of shell-like outflows, such as that from L 1551–IRS5, are less obvious. We discuss the current observational status of both types of flow, and hypothesize an evolutionary connection between them. A large and well-defined outflow sample is urgently required, to permit the establishment of an age-sequence; such a sample would also provide the basis for a proper investigation of outflow energetics and interaction with the ISM.

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. 123 - 140
Copyright
Copyright © Kluwer 1997 

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