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Atomic carbon near the molecular cloud/HII region interface in S 140.

J. Hernichel, D. Krause, R. Roehrig, JÜRGEN STUTZKI, G. Winnewisser

Abstract

The [C I] 3 P 1 → 3 P 0 fine structure line of atomic carbon at 492 GHz in the edge-on interface between the molecular cloud L 1204 and the S 140 H II region were observed with the KOSMA telescope on Gornergrat, Switzerland. It is found that the [C I]-emission near the interface consists of a narrow velocity component with position and line width similar to that of the ambient molecular cloud material, superimposed on a wider component (FWHM ∼ 15 km/s) exhibiting a line profile similar to that of the higher velocity material visible in CO and carrying most of the C I column density

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Key concepts: Physics, Atomic carbon, Molecular cloud, Astrophysics, Full width at half maximum, Line (geometry), Carbon fibers, Telescope