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Molecules in Bipolar Outflows

Published online by Cambridge University Press:  21 December 2011

Mario Tafalla  and
Rafael Bachiller
Mario Tafalla
Affiliation:
Observatorio Astronómico Nacional (IGN), Alfonso XII 3, 28014 Madrid, Spain email: [email protected], [email protected]
Rafael Bachiller
Affiliation:
Observatorio Astronómico Nacional (IGN), Alfonso XII 3, 28014 Madrid, Spain email: [email protected], [email protected]
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Abstract

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Bipolar outflows constitute some of the best laboratories to study shock chemistry in the interstellar medium. A number of molecular species have their abundance enhanced by several orders of magnitude in the outflow gas, likely as a combined result of dust mantle disruption and high temperature gas chemistry, and therefore become sensitive indicators of the physical changes taking place in the shock. Identifying these species and understanding their chemical behavior is therefore of high interest both to chemical studies and to our understanding of the star-formation process. Here we review some of the recent progress in the study of the molecular composition of bipolar outflows, with emphasis in the tracers most relevant for shock chemistry. As we discuss, there has been rapid progress both in characterizing the molecular composition of certain outflows as well as in modeling the chemical processes likely involved. However, a number of limitations still affect our understanding of outflow chemistry. These include a very limited statistical approach in the observations and a dependence of the models on plane-parallel shocks, which cannot reproduce the observed wing morphology of the lines. We finish our contribution by discussing the chemistry of the so-called extremely high velocity component, which seems different from the rest of the outflow and may originate in the wind from the very vicinity of the protostar.

Keywords

ISM: moleculesISM: jets and outflowsstars: formationradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S280: The Molecular Universe , June 2011 , pp. 88 - 102
Copyright
Copyright © International Astronomical Union 2011

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