Computer Science – Numerical Analysis
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422..136t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 1, p. 136-152
Computer Science
Numerical Analysis
57
Angular Resolution, Astronomical Models, Chemical Composition, H Ii Regions, High Resolution, Molecular Gases, Molecular Spectra, Orion Nebula, Photodissociation, Radio Astronomy, Radio Emission, Astronomical Interferometry, Astronomical Observatories, Numerical Analysis, Radio Interferometers, Spatial Distribution, Telescopes
Scientific paper
We present observations of the molecular component of the Orion Bar, a prototypical Photodissociation Region (PDR) illuminated by the Trapezium cluster. The high angular resolution (6 sec-10 sec) that we have achieved by combining single-dish and interferometric observations has allowed us to examine in detail the spatial and kinematic morphology of this region and to estimate the physical characteristics of the molecular gas it contains. Our observations indicate that this PDR can be essentially described as a homogeneously distributed slab of moderately dense material (approximately 5 x 104/cu cm), in which are embedded a small number of dense (greater than 106/cu cm) clumps. The latter play little or no role in determining the thickness and kinetic temperature structure of this PDR. This observational picture is largely supported by PDR model calculations for this region, which we describe in detail in this work. We also find our model predictions of the intensities of a variety of atomic and molecular lines to be in good general agreement with a number of previous observations.
Goldsmith Paul F.
Meixner Margaret
Tauber Jan A.
Tielens Alexander G. G. M.
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