Fast molecular jet from L1157-mm
Journal
Date Issued
2015
Author(s)
Tafalla, M.
•
Bachiller, R.
•
Lefloch, B.
•
Rodríguez-Fernández, N.
•
•
López-Sepulcre, A.
•
Description
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.
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-1 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'').
Conclusions: The EHV jet seen in SiO probably excites L1157-B1 and the other chemically active spots of the L1157 outflow.
Conclusions: The EHV jet seen in SiO probably excites L1157-B1 and the other chemically active spots of the L1157 outflow.
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 http://www.aanda.org
Volume
573
Start page
L2
Issn Identifier
0004-6361
Ads BibCode
2015A&A...573L...2T
Rights
open.access
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