Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.3904t&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #39.04; Bulletin of the American Astronomical Society, Vol. 25, p.857
Other
Scientific paper
The Orion Bright Bar is a nearby example of an edge-on Photodissociation Region (PDR), in which molecular gas is being illuminated by the intense UV flux from the Trapezium cluster. We have observed this region with the Hat Creek mm-wave interferometer in the CO and (13) CO J=1->0 lines, as well as in the HCO(+) J=1->0 line. Because of the extended nature of the CO emission, we have combined the images obtained by the interferometer with single-dish observations, in order to obtain high-angular resolution maps with no missing flux; the synthesized angular resolution of the combined maps is ~ 6-10 arcseconds. In addition to these tracers of the molecular morphology of this region, we present observations of the 609mu fine structure line of neutral atomic carbon, which traces the interface between the ionized (C(+) ) medium and the molecular material. These observations were obtained at the CalTech Submillimeter Observatory with an angular resolution of ~ 15 arcseconds. Our observations indicate that this PDR is well described as a homogeneously distributed slab of moderately dense material ( ~ 5times 10(4) cm(-3) ), in which are embedded a small number of dense (>10(6) cm(-3) ) clumps. The latter play little or no role in determining the thickness and kinetic temperature structure of this PDR, in marked contrast to other well-known PDRS such as M17SW. The observational picture is largely supported by PDR model calculations for this region, which also account well for the intensities of a variety of other previously observed atomic and molecular emission lines.
Lis D. T.
Meixner Matthew
Tauber Jan A.
Tielens Alexander G. G. M.
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