Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454..307b&link_type=abstract
Astrophysical Journal v.454, p.307
Astronomy and Astrophysics
Astronomy
10
Ism: H Ii Regions, Infrared: Ism: Lines And Bands, Ism: Clouds, Ism: Individual Ngc Number: Ngc 6334, Ism: Kinematics And Dynamics
Scientific paper
We have observed the 158 microns 2P3/2-2P1/2 fine-structure transition of C+ along the ridge of star formation in NGC 6334 with a velocity resolution comparable to that of millimeter-wave molecular and recombination lines. The C II radiation is bright and widespread, with integrated intensities Iint > 10-4 ergs cm-2 s-1 sr-1 along a line extending over 16'. There is a general correlation between regions of intense C II emission and warm dust and CO radiation, such as would be expected for phenomena which are all associated with star formation, but no small-scale correspondence is found. The C II excitation temperature is higher than that of the dust or CO. The line profiles are complex, with evidence for self-absorption as well as emission from H II regions. No single physical component of the gas appears responsible for the observed C II line profiles, as is usually the case for CO or recombination lines. Rather, the PDR, ionized gas, and colder or more tenuous material all contribute, with relative importance determined by the geometry and energetics of the region.
Betz Albert L.
Boreiko Rita T.
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