First NH3 detection of the Orion Bar

Details First NH3 detection of the Orion Bar First NH3 detection of the Orion Bar

2003-03-05

arxiv.org/abs/astro-ph/0303122v1

Astron.Astrophys. 402 (2003) L69-L72

Astronomy and Astrophysics

Astrophysics

4 pages with 2 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20030342

Odin has successfully observed three regions in the Orion A cloud, i.e. Ori KL, Ori S and the Orion Bar, in the 572.5 GHz rotational ground state line of ammonia, ortho-NH3 (J,K) = (1,0) -> (0,0), and the result for the Orion Bar represents the first detection in an ammonia line. Several velocity components are present in the data. Specifically, the observed line profile from the Orion Bar can be decomposed into two components, which are in agreement with observations in high-J CO lines by Wilson et al. 2001. Using the source model for the Orion Bar by these authors, our Odin observation implies a total ammonia abundance of NH3/H2 = 5E-9.

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