Other
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..759s&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 759
Other
Interstellar Medium, Molecules, Orion-Irc2
Scientific paper
We present a high signal-to-noise grating spectrum between 43-196.9 μm of the Orion molecular cloud towards the massive star-forming region IRc2, obtained with the Long Wavelength Spectrometer (LWS) on board ISO. CO lines up to J=20-19 have been detected around Orion-IRc2, while in the central position higher quantum numbers have been found. Lines of the 13CO isotopic species have also been observed in several directions. In addition, high quality LWS-FP observations of some CO lines have been performed towards IRc2. The data analysis suggest that at least two regions of Orion-IRc2 contribute to the observed CO emission: the ridge, responsible of the spatial extension, and the plateau, dominating the line flux observed towards the center of the map. CO emission through the Orion molecular cloud has been studied in terms of temperature, column density and H2 volume density, using and Large Velocity Gradient (LVG) model. We find that the flux ratio of the several CO lines can not be explained in terms of an homogeneous source, but a gradient in temperature and density must be involved. Besides the CO lines, several molecular and fine-structure atomic lines have been detected in all observed positions. A detailed discussion of other molecular species rather than CO (H2O, OH...) can be found in Cernicharo et al. (1999).
Cernicharo Jose
Gonzalez-Alfonso Eduardo
Leeks Sarah J.
Lefloch Bertrand
Najarro Francisco
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