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 Title: Shocks and molecules in protostellar outflows Author(s): Arce, Héctor Subject(s): Mini-symposium: Astronomical Molecular Spectroscopy in the Age of ALMA Abstract: As protostars form through the gravitational infall of material from their parent molecular cloud, they power energetic bipolar outflows that interact with the surrounding medium. Protostellar outflows are important to the chemical evolution of star forming regions, as the shocks produced by the interaction of the high-velocity protostellar wind and the ambient cloud can heat the surrounding medium and trigger chemical and physical processes that would otherwise not take place in a quiescent molecular cloud. Protostellar outflows, are therefore a great laboratory to study shock physics and shock-induced chemistry. I will present results from millimeter-wave observations of a small sample of outflow shocks. The spectra show clear evidence of the existence of complex organic molecules (e.g., methyl formate, ethanol, acetaldehyde) and high abundance of certain simple molecules (e.g., HCO$^+$, HCN, H$_2$O) in outflows. Results indicate that, most likely, the complex species formed on the surface of grains and were then ejected from the grain mantles by the shock. Spectral surveys of shocked regions using ALMA could therefore be used to probe the composition of dust in molecular clouds. Our results demonstrate that outflows modify the chemical composition of the surrounding gaseous environment and that this needs to be considered when using certain species to study active star forming regions. Issue Date: 2014-06-19 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Arce, H. SHOCKS AND MOLECULES IN PROTOSTELLAR OUTFLOWS. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.RF09 Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/59137 DOI: https://doi.org/10.15278/isms.2014.RF09 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-12-082015-04-14
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