A physical analysis of S II and C II layers in four molecular cloud edges - NGC 3576, NGC 6334, S 87, and S 88

Astronomy and Astrophysics – Astrophysics

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Carbon, H Ii Regions, Interstellar Chemistry, Molecular Clouds, Silicon, Astronomical Spectroscopy, Atomic Recombination

Scientific paper

A method is described for the physical analysis of S II layers in molecular cloud edges using only one sulfur recombination line and two recently derived statistical relationships for S II layers known to be applicable to all known S II layers. The method was applied to analyze S II layers in the following molecular cloud edges with one sulfur line known: NGC 3576, NGC 6334, S 87, and S 88. As found elsewhere in 10 other S II layers, the S II layers studied show that the microturbulent velocity is roughly equal to a value between a S II layer and its associated nearby C II layer in the same cloud, and the electron temperature in the S II layer is about 40 percent lower than in its associated nearby C II layer.

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