The jet/counterjet IR symmetry of HH34 and the size of the jet formation region

Details The jet/counterjet IR symmetry of HH34 and the size of the jet formation region The jet/counterjet IR symmetry of HH34 and the size of the jet formation region

2011-01-23

arxiv.org/abs/1101.4336v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication, ApJL

Scientific paper

We present a 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 approx.1 pc) and a complete lack of symmetry close to the source (at distances of approx. 1.e+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.

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