AAS 201st Meeting, January, 2003
Session 20. Star Formation I
Poster, Monday, January 6, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[20.01] Investigating the HH 212 Molecular Outflow: the Jet- and Wind-Driven Models

N.L. Chapman, L.G. Mundy (UMD), C.-F. Lee (JPL), S.M. White (UMD)

Molecular outflows are a common stage in star formation and over 200 outflows have been discovered to date, but the fundamental driving mechanism for outflows remains uncertain. The current leading theories are the wide-angle wind-driven model (Shu et al. 1991) and the jet-driven model (Raga & Cabrit 1993; Masson & Chernin 1993). Using the BIMA interferometer, we have made observations of the HH 212 molecular outflow in several molecules (CO, HCO+, SiO). This outflow was selected because of its high-degree of bipolar symmetry, the numerous well- defined H2 bow shocks (Zinnecker et al. 1998), and excellent morphological relationship of H2 to CO (Lee et al. 2000). Molecular shock physics describes how molecules behave at different temperatures and velocities. Using this, it is possible to describe the emission characteristics expected in both wind- and jet-driven scenarios. We compare our observations with the models to investigate the driving mechanism of molecular outflows.

This research was supported by NASA grant NAG 510611.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.