Shock Excited H_2 Emission in the L1448 Outflow.

Details Shock Excited H_2 Emission in the L1448 Outflow. Shock Excited H_2 Emission in the L1448 Outflow.

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.8105p&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #81.05; Bulletin of the American Astronomical Society, Vol. 25, p.1419

Astronomy and Astrophysics

Astronomy

Scientific paper

We present near-infrared imaging of the young outflow L1448 in both 2.122 microns 1 - 0 S(1) and 2.223 microns 1 - 0 S(0) lines of molecular hydrogen. The observations were performed, at the WIRO 2.3 m telescope, with the University of Rochester 256 x 256 InSb imager. A 1.5% CVF filter was used for the 1 -0 S(1) imaging and the Naval Research Lab K-band Fabry-Perot (Delta lambda /lambda = 850) was used for the 1 - 0 S(0) observations. The 2.223 microns emission closely parallels the highly collimated and knotty structures previously observed at 2.122 microns (Bally, Lada, & Lane, 1993). The predicted theoretical line ratio [1 - 0 S(0)/1 - 0 S(1)] is expected to be 0.45 for fluorescence and ranges from 0.21 to 0.22 for shock excited emission (Wolfire & Konigl, 1991). The observed line ratio of 0.22 +/- 0.04 confirms the shock excitation origin of the molecular hydrogen emission in L1448. This work was supported in part by the Smithsonian Institution Scholarly Studies Program and the Office of Naval Research. Infrared Astronomy at WIRO is supported by a grant from the NSF (AST91-16644). Bally, J., Lada, E. A., & Lane, A. P. 1993, Ap. J. in press Wolfire, M. G., & Konigl, A. 1991, Ap. J. 383, 205

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