High spatial resolution observations of neutral atomic carbon in the molecular clouds M17 and W51

Astronomy and Astrophysics – Astronomy

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Carbon, Infrared Sources (Astronomy), Interstellar Chemistry, Molecular Clouds, Photodissociation, Spatial Resolution, Emission Spectra, Fine Structure, Forbidden Transitions, H Ii Regions

Scientific paper

The 370-micron 3P2-3P1 fine structure line of neutral atomic carbon in the molecular clouds M17 and W51 has been mapped with 25-arcmin resolution. In the H II region/molecular cloud interface in M17, bright C I forbidden line emission comes from a wide (about 1 pc) ridge at the edge of the molecular cloud. In W51, the C I forbidden line emission peaks on the compact IR source and H II region IRS 2, and at the interface between the extended H II region IRS 1 and the dense molecular condensation W51 Main. Spatial scales of the C I forbidden line emission, relative location of C I and C18O, and mean C I/CO ratio are similar in the two molecular clouds. The data are in good agreement with an origin of the atomic carbon in photodissociation regions created by UV radiation illuminating a clumpy molecular cloud.

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