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Published April 1, 2011 | Published
Journal Article Open

The Jet/Counterjet Infrared Symmetry of HH 34 and the Size of the Jet Formation Region


We present new Spitzer IRAC images of the HH 34 outflow. These are the first images that detect both the knots along the southern jet and the northern counterjet (the counterjet knots were only detected previously in a long-slit spectrum). This result removes the problem of the apparent coexistence of a large-scale symmetry (at distances of up to ~1 pc) and a complete lack of symmetry close to the source (at distances of ~10^(17) cm) for this outflow. We present a quantitative evaluation of the newly found symmetry between the HH 34 jet and counterjet, and show that the observed degree of symmetry implies that the jet production region has a characteristic size <2.8 AU. This is the strongest constraint yet derived for the size of the region in which HH jets are produced.

Additional Information

© 2011 American Astronomical Society. Received 2010 December 14; accepted 2011 January 12; published 2011 March 4. This work is based in part on observations made with the Spitzer Space Telescope which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. The work of A.R. and V.L. was supported by the CONACyT grants 61547, 101356, and 101975.

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