2003A&A...402L..69L

Query : 2003A&A...402L..69L

2003A&A...402L..69L - Astronomy and Astrophysics, volume 402L69-72 (2003/5-2)

First NH3 detection of the Orion Bar.

LARSSON B., LISEAU R., BERGMAN P., BERNATH P., BLACK J.H., BOOTH R.S., BUAT V., CURRY C.L., ENCRENAZ P., FALGARONE E., FELDMAN P., FICH M., FLOREN H.-G., FRISK U., GERIN M., GREGERSEN E.M., HARJU J., HASEGAWA T., JOHANSSON L.E.B., KWOK S., LECACHEUX A., LILJESTROEM T., MATTILA K., MITCHELL G.F., NORDH L., OLBERG M., OLOFSSON G., PAGANI L., PLUME R., RISTORCELLI I., SANDQVIST A., VON SCHEELE F., TOTHILL N.F.H., VOLK K., WILSON C.D. and HJALMARSON A.

Abstract (from CDS):

Odin has successfully observed three regions in the OrionA cloud, i.e. Ori KL, Ori S and the Orion Bar, in the 572.5GHz 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. (2001ApJ...557..240W). Using the source model for the Orion Bar by these authors, our Odin observation implies a total ammonia abundance of NH3/H2=5x10–9.

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Journal keyword(s): ISM: individual objects: Orion A - clouds - molecules - abundances - stars: formation

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Orion S reg 05 35 12.9 -05 24 10           ~ 156 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 1004 0
4 NAME Ori A MoC 05 38 -07.1           ~ 3187 0

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