Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-12-21
Astronomy and Astrophysics
Astrophysics
10 pages, 3 figures
Scientific paper
10.1086/312489
We report on sensitive far-infrared observations of $^{12}$CO pure rotational transitions in the OMC-1 core of Orion. The lines were observed with the Long Wavelength Spectrometer (LWS) in the grating mode on board the Infrared Space Observatory (ISO), covering the 43-197 $\mu$m wavelength range. The transitions from $J_{up}=14$ up to $J_{up}=19$ have been identified across the whole OMC-1 core and lines up to $J_{up}= 43$ have been detected towards the central region, KL/IRc2. In addition, we have taken high-quality spectra in the Fabry-Perot mode of some of the CO lines. In KL/IRc2 the lines are satisfactorily accounted for by a three-temperature model describing the plateau and ridge emission. The fluxes detected in the high-$J$ transitions ($J_{up} > 34$) reveal the presence of a very hot and dense gas component ($T=1500-2500$ K; $\rm N(CO)$=2\times 10^{17}\cmmd$), probably originating from some of the embedded sources previously observed in the $\rm H_2$ near-infrared lines. At all other positions in the OMC-1 core, we estimate kinetic temperatures $\geq 80$ K and as high as 150 K at some positions around IRc2, from a simple Large-Velocity Gradient model.
Cernicharo Jose
Gonzalez-Alfonso Eduardo
Leeks Sarah
Lefloch Bertrand
Sempere Maria J.
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