CO Observations of the tex2html_wrap_inline211-Orionis Ring

W.J. Lang , M.R.W. Masheder, PASA, 15 (1), 70
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CO Observations of the tex2html_wrap_inline211-Orionis Ring

W.J. Lang tex2html_wrap_inline213
M.R.W. Masheder tex2html_wrap_inline213

tex2html_wrap_inline213 H.H. Wills Physics Laboratory, Bristol University, Tyndall Ave, Bristol, U.K, BS8 1TL
w.j.lang@bristol.ac.uk, mike.masheder@bristol.ac.uk

Abstract:

We present results from a new tex2html_wrap_inline219CO(J=tex2html_wrap_inline221) survey of the tex2html_wrap_inline211-Orionis region. The observations cover 110 square degrees uniformly on a Nyquist-sampled grid. We discover CO-emission at levels far lower than possible in previous surveys, revealing a structure similar to that seen in IRAS 100tex2html_wrap_inline225 maps. We derive a total molecular mass of  1.1tex2html_wrap_inline22710tex2html_wrap_inline229 Mtex2html_wrap_inline231. A possible explanation for the isolated and localised outbreak of star-formation in the region is discussed.

Keywords: ISM: bubbles -- ISM:clouds -- ISM:HII regions -- ISM: molecules


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