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|Title:||Fast molecular jet from L1157-mm||Authors:||Tafalla, M.
|Issue Date:||2015||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||573||First Page:||L2||Abstract:||Context. L1157-mm powers a molecular outflow that is well-known for its shock-induced chemical activity in several hot-spots. Aims: We have studied the molecular emission toward L1157-mm searching for a jet component responsible for these spots. Methods: We used the IRAM 30 m telescope to observe the vicinity of L1157-mm in several lines of SiO. Results: The SiO(5-4) and SiO(6-5) spectra toward L1157-mm present blue and red detached components about 45 km s<SUP>-1</SUP> away from the ambient cloud. These extremely high-velocity (EHV) components are similar to those found in the L1448 and IRAS 04166+2706 outflows and probably arise from a molecular jet driven by L1157-mm. Observations of off-center positions indicate that the jet is unresolved in SiO(5-4) (< 11''). <BR /> Conclusions: The EHV jet seen in SiO probably excites L1157-B1 and the other chemically active spots of the L1157 outflow. <P />Based on IRAM 30 m Telescope observations. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).Tables 1 and 2 are available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201425255/olm">http://www.aanda.org||Acknowledgments:||We thank the IRAM staff for assistance and the referee for a careful reading of the manuscript. We acknowledge support from projects FIS2012-32096 and AYA2012-32032 of Spanish MINECO and from the MICINN program CONSOLIDER INGENIO 2010, grant “Molecular Astrophysics: The Herschel and ALMA era – ASTROMOL” (ref.: CSD2009-00038). LP has received funding from the European Union Seventh Framework Programme (FP7/20072013) under grant agreement No. 267251. This research has made use of NASA’s Astrophysics Data System Bibliographic Services.||URI:||http://hdl.handle.net/20.500.12386/27335||URL:||https://www.aanda.org/articles/aa/abs/2015/01/aa25255-14/aa25255-14.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201425255||Bibcode ADS:||2015A&A...573L...2T||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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