Fast molecular jet from L1157-mm

Abstract

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.

6 pages, 8 figures. Accepted for publication in Astronomy & Astrophysics

References in corpus (11)

• PROSAC: A Submillimeter Array Survey of Low-Mass Protostars. I. Overview of Program: Envelopes, Disks, Outflows and Hot Cores
• Water in star-forming regions with Herschel (WISH): II. Evolution of 557 GHz 110-101 emission in low-mass protostars
• TADPOL: A 1.3 mm Survey of Dust Polarization in Star-forming Cores and Regions
• A molecular survey of outflow gas: velocity-dependent shock chemistry and the peculiar composition of the EHV gas
• A Flattened Protostellar Envelope in Absorption around L1157
• Extreme Active Molecular Jets in L1448C
• The CHESS chemical Herschel surveys of star forming regions: Peering into the protostellar shock L1157-B1. I. Shock chemical complexity
• Shells, jets, and internal working surfaces in the molecular outflow from IRAS 04166+2706
• The CHESS survey of the L1157-B1 shock region: CO spectral signatures of jet-driven bowshocks
• CHESS, Chemical Herschel surveys of star forming regions:Peering into the protostellar shock L1157-B1
• The CHESS survey of the L1157-B1 shock: the dissociative jet shock as revealed by Herschel--PACS

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