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Extended far-infrared CO emission in the OMC-1 core of Orion

AuthorsSempere, María J.; Cernicharo, José ; Lefloch, Bertrand; González-Alfonso, E.; Leeks, S.
KeywordsRadiative transfer
ISM: molecules
ISM: individual (OMC-1)
Infrared: ISM: lines and bands
Molecular data
Line: identification
Issue Date31-Jan-2000
PublisherUniversity of Chicago Press
CitationAstrophysical Journal 530: L123-L127 (2000)
AbstractWe report on sensitive far infrared observations of 12CO pure rotational transitions in the OMC-1 core of Orion. The lines were observed with the long-wavelength spectrometer in the grating mode on board the Infrared Space Observatory, covering the 43-197 μm wavelength range. The transitions from Jup = 14 up to Jup = 19 have been identified across the whole OMC-1 core, and lines up to Jup = 43 have been detected toward 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 (Jup > 34) reveal the presence of a very hot and dense gas component [T = 1500-2500 K; N(CO) = 2 × 1017 cm-2] probably originating from some of the embedded sources previously observed in the H2 near-infrared lines. At all other positions in the OMC-1 core, we estimate kinetic temperatures ≥80 K and as high as 150 K at some positions around IRc2, from a simple large-velocity gradient model.
Description5 pags., 3 figs. 1 tab.
Publisher version (URL)https://doi.org/10.1086/312489
Identifiersdoi: 10.1086/312489
issn: 0004-637X
Appears in Collections:(CFMAC-IEM) Artículos
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