NOAO >   Observing Info >   Approved Programs >   2006B-0182

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Proposal Information for 2006B-0182


PI: Patrick Hartigan, Rice University, hartigan@sparky.rice.edu
Address: Physics Department, 6100 S. Main, Houston, TX 77005, USA

CoI: Adam Frank, University of Rochester

Title: Dynamics of a Jet/Cloud Collision in Astrophysics and in the Laboratory

Abstract: HH 110 is an extraordinary stream of shocked gas that forms when a highly supersonic jet from a young star impacts a dense dark cloud at an oblique angle. Previous spectral observations of this source fail by factors of 3 - 5 to reach the thermal broadening limit, which is required to distinguish bulk motion, turbulence, and thermal motions from one another in the emitting gas. By employing an unusual mode of observation with the echelle, we will be able to simultaneously obtain velocity images of all the important red emission lines in a single exposure, making it possible map the entire source in a modest observing run at echelle resolution. The resulting datacubes of ionization fraction and electron density as a function of spatial position and radial velocity, together with dynamical maps of line widths from each emission line will create an unprecendented database for the study of shocked, jet-like flows. The proposed observations will provide a direct link to ongoing DOE-sponsored laboratory laser experiments designed specifically as analogs to HH 110, and will create a fundamental test bed for existing 3D numerical codes that model shocked dynamics and the onset of turbulence.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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