Molecular Outflows from High-Mass Protostars |
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Authors: | Michael D Smith |
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Institution: | 1. Astronomisches Institut der, Universit?t Würzburg, Am Hubland, 97074, Würzburg, Germany
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Abstract: | The youngest protostars are obscured from direct view by a high column of molecular gas. Nevertheless, their presence is betrayed
through spectacular infrared outflows. I demonstrate here that infrared spectroscopy has the potential to reveal a remarkable
variety of details concerning the underlying physics.
Near-infrared spectroscopic analyses of the OMC-1, DR 21 & Cepheus A outflows are discussed here. Molecular hydrogen is vibrationally
excited by collisions in shock waves. In OMC-1, the ortho-para ratio has been mapped. The ratio is close to 3, suggesting
efficient shock thermalisation. In DR 21, shocked (up to the first vibrational level) and fluorescent (higher v-levels) components
have been successfully separated. In Cepheus A, non-LTE effects imply low densities.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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