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SURVEY OF CARBON MONOXIDE OUTFLOWS ASSOCIATED WITH MOLECULAR HYDROGEN EMISSION FEATURES IN THE NORTHERN ORION A MOLECULAR CLOUD

  • Park Geum-Sook (International Center for Astrophysics, Korea Astronomy and Space Science Institute) ;
  • Choi Min-Ho (International Center for Astrophysics, Korea Astronomy and Space Science Institute)
  • Published : 2006.06.01

Abstract

Near-IR $H_2$ emission features in the northern region of the Orion A giant molecular cloud were observed in the $CO\;J\;=\;1\;{\rightarrow}\;0$ line in search of CO outflows. Out of the 30 sources surveyed, CO line wings were detected toward 28 positions, suggesting a strong correlation between $H_2$ jets and CO outflows. Blueshifted wings were detected toward 26 positions while redshifted wings were detected toward 15 positions, which suggests that there is a bias in the source selection. The bias is more severe in OMC 3 than in OMC 2. Since the protostars in OMC 3 are younger and more deeply embedded, the bias may be caused by the difference of extinction between blueshifted and redshifted outflows. Some physical parameters of the outflows were derived from the line profiles.

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