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Fast molecular jet from L1157-mm

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.

preprint2014arXivOpen access
M. TafallaR. BachillerB. LeflochN. Rodríguez-FernándezC. CodellaA. López-SepulcreL. Podio
astro-ph.GA
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M. TafallaR. BachillerB. LeflochN. Rodríguez-FernándezC. CodellaA. López-SepulcreL. Podio

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