Infrared H_2 imaging of the highly symmetric proto-stellar jets HH212 and HH111

Details Infrared H_2 imaging of the highly symmetric proto-stellar jets HH212 and HH111 Infrared H_2 imaging of the highly symmetric proto-stellar jets HH212 and HH111

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7368m&link_type=abstract

HST Proposal ID #7368

Computer Science

Hst Proposal Id #7368 Stellar Ejecta

Scientific paper

We propose to obtain deep diffraction-limited images of two highly collimated protostellar jets in the v=1-0 S{1} line of molecular hydrogen at 2.122 micron using NICMOS. HH111 is a well-known jet visible at optical wavelengths, and the new NICMOS data will be analyzed in conjunction with existing WFPC2 imaging. HH212 is a newly discovered jet, obscured by its parent molecular cloud core and only detectable at near-IR wavelengths. The high degree of symmetry seen in both jets makes them crucial template objects for studying the earliest phases of jet formation, since the underlying ``patterns'' have not been erased by strong environmental effects. The new images will however enable us to study the interaction of the jets with their surroundings, where the H2 line traces shocks at the interface between the jet and the ambient gas. In particular, we will examine the hypothesis that molecular outflows are created by the entrainment of gas into the wings of jet bow-shocks. The Cycle 7 data will be used as the first epoch in proper motion study: by measuring transverse velocities as small as 40km/s over the NICMOS mission lifetime, we will study the dynamical evolution of the jets in comparison with theoretical models. Finally, we will use deep continuum images to determine the structure of faint reflection nebulae seen around the jet driving sources, in order to determine whether these are cavities excavated by the molecular outflows, or the upper surface of a large-scale disk around the source.

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