First Evidence of a Precessing Jet Excavating a Protostellar Envelope

Details First Evidence of a Precessing Jet Excavating a Protostellar Envelope First Evidence of a Precessing Jet Excavating a Protostellar Envelope

2006-08-08

arxiv.org/abs/astro-ph/0608162v1

Astrophys.J.647:L159-L162,2006

Astronomy and Astrophysics

Astrophysics

11 pages, 1 figure, 1 table

Scientific paper

10.1086/507449

We present new, sensitive, near-infrared images of the Class I protostar, Elias 29, in the Ophiuchus cloud core. To explore the relationship between the infall envelope and the outflow, narrowband H2 1-0 S(1), Br-gamma, and narrowband K-continuum filters were used to image the source with the Wide-Field Infrared Camera on the Hale 5m telescope and with Persson's Auxiliary Nasmyth Infrared Camera on the Baade 6.5 m telescope. The source appears as a bipolar, scattered light nebula, with a wide opening angle in all filters, as is typical for late-stage protostars. However, the pure H2 emission-line images point to the presence of a heretofore undetected precessing jet. It is argued that high-velocity, narrow, precessing jets provide the mechanism for creating the observed wide-angled outflow cavity in this source.

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