%0 Journal Article
%T Fast molecular jet from L1157-mm
%A M. Tafalla
%A R. Bachiller
%A B. Lefloch
%A N. Rodr¨ªguez-Fern¨¢ndez
%A C. Codella
%A A. L¨®pez-Sepulcre
%A L. Podio
%J Physics
%D 2014
%I arXiv
%R 10.1051/0004-6361/201425255
%X L1157-mm powers a molecular outflow that is well-known for its shock-induced chemical activity in several hot-spots. We have studied the molecular emission toward L1157-mm searching for a jet component responsible for these spots. We used the IRAM 30m telescope to observe the vicinity of L1157-mm in several lines of SiO. The SiO(5-4) and SiO(6-5) spectra toward L1157-mm present blue and red detached components about 45 km/s 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"). The EHV jet seen in SiO probably excites L1157-B1 and the other chemically active spots of the L1157 outflow.
%U http://arxiv.org/abs/1412.1476v1