2003A&A...408..231B

Query : 2003A&A...408..231B

2003A&A...408..231B - Astronomy and Astrophysics, volume 408231-235 (2003/9-2)

Kinetic temperatures in the Orion Bar.

BATRLA W. and WILSON T.L.

Abstract (from CDS):

We report the detection of the (J, K)=(1, 1), (2, 2) and (4, 4) inversion lines of ammonia towards the Photo Dissociation Region (PDR) of the Orion Bar. The NH3 emission is found in the same location as emission from HCN. Temperatures determined from line intensity ratios indicate a warm gas with Tk of ∼150K. This value is inconsistent with temperatures predicted from models of the gas phase chemistry of dense PDRs. We propose that the emission arises from ammonia released into the gas phase from the evaporation of dense clumps. From measurements of the J=2-1 line of C18O, we obtain beam-averaged column densities for those positions where the (1, 1), (2, 2) and (4, 4) inversion lines were measured. The ammonia to C18O abundance ratio is 1.4±0.5x10–2.

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Journal keyword(s): ISM: clouds - ISM: individual objects: Orion - ISM: molecules - radio lines: ISM

Simbad objects: 1

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Number of rows : 1
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 Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 1004 0

Query : 2003A&A...408..231B

Basic data :
NAME Orion Bright Bar -- Region defined in the Sky
Other object types: otypes_help 		reg ()
ICRS coord. (ep=J2000) : 		05 35 22.30 -05 24 33.0 (Optical) [ ] D 2011MNRAS.417..420M
FK4 coord. (ep=B1950 eq=1950) : 		05 32 54.87 -05 26 25.9 [ ]
Gal coord. (ep=J2000) : 		209.04076 -19.37127 [ ]
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Identifiers (4) :
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NAME Orion Bright Bar NAME Ori Bar NAME Ori Bright Bar NAME Orion Bar

References (1004 between 1850 and 2026) (Total 1004)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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