The HH 46/47 mid-IR cavity. New Spitzer Observations and models.

Details The HH 46/47 mid-IR cavity. New Spitzer Observations and models. The HH 46/47 mid-IR cavity. New Spitzer Observations and models.

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dppcm1001n&link_type=abstract

American Physical Society, 46th Annual Meeting of the Division of Plasma Physics, 15-19 November, 2004, Savannah, GA. MEETING I

Physics

Plasma Physics

Scientific paper

We present the early release observations of the HH 46/47 system and HH 46 IRS1 source, taken with the three instruments aboard the Spitzer Space Telescope. The optically invisible SW lobe, driven by the HH 47C bow shock is revealed in full detail by the IRAC images, and displays a ``loop'' like morphology. Both of the mid-infrared outflow lobes are narrower than those of CO flow. We believe that the combination of emission by H2 rotational lines (S(11)-S(4)) and some atomic lines, which fall within the IRAC passbands, are responsible for the bulk of the observed emission, although contributions from the 3.3, 6.2 and 7.7 μ PAH emission bands can not be ruled out. We have modeled the limb-brightened cavity seen in the new Spitzer IR images of the SW lobe of HH 46/47 as the bow shock driven by an outflow from a young, low mass star. We present models in which the outflow is a perfectly collimated, straight jet, in which we have a precessing jet, and finally a model in which the outflow takes the form of a latitude-dependent wind. We study cases in which the outflow moves into a constant density cloud and into a stratified cloud. We find that the best agreement with the observed cavity is obtained for the precessing jet in a stratified cloud. However, the ``straight jet'' (travelling in a stratified cloud) also gives cavity shapes close to the observed one. The ``latitude-dependent wind'' model that we have computed gives cavity shapes which are substantially wider than the observed cavity.

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