HH 114 MMS: a new chemically active outflow

Abstract

Context. A small group of bipolar protostellar outflows display strong emission from shock-tracer molecules such as SiO and CH3OH, and are generally referred to as "chemically active." The best-studied outflow from this group is the one in L 1157. Aims. We study the molecular emission from the bipolar outflow powered by the very young stellar object HH 114 MMS and compare its chemical composition with that of the L1157 outflow. Methods. We have used the IRAM 30m radio telescope to observe a number of transitions from CO, SiO, CH3OH, SO, CS, HCN, and HCO+ toward the HH 114 MMS outflow. The observations consist of maps and a two-position molecular survey. Results. The HH 114 MMS outflow presents strong emission from a number of shock-tracer molecules that dominate the appearance of the maps around the central source. The abundance of these molecules is comparable to the abundance in L 1157. Conclusions. The outflow from HH 114 MMS is a spectacular new case of a chemically active outflow.

4 pages, 3 figures. Accepted for publication in Astronomy & Astrophysics

References in corpus (3)

• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• A molecular survey of outflow gas: velocity-dependent shock chemistry and the peculiar composition of the EHV gas
• Molecules in Bipolar Outflows

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• SMA line observations of the CH${}_3$OH-maser outflow in DR21(OH)
• Characterising the physical and chemical properties of a young Class 0 protostellar core embedded in the Orion B9 filament