Detection of the lambda 609 micrometer line of neutral atomic carbon in the Ring nebula

Details Detection of the lambda 609 micrometer line of neutral atomic carbon in the Ring nebula Detection of the lambda 609 micrometer line of neutral atomic carbon in the Ring nebula

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281l..93b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 3, p. L93-L96

Astronomy and Astrophysics

Astronomy

21

Carbon, Carbon Monoxide, Line Spectra, Neutral Gases, Planetary Nebulae, Radio Astronomy, Radio Emission, Hydrogen, Submillimeter Waves

Scientific paper

We report the detection of the 609 micrometer (492 GHz) (3P1 transition to 3P0) fine-structure line of neutral atomic carbon (CI) in the Ring Nebula (NGC 6720). The emission is spatially extended, and we have been able to make a preliminary strip map along the minor axis of the nebula. The peak observed emission is approximately 500 mK, and the line width is approximately 40 km/s, characteristic of the expanding nebula. The C I column densities at the positions where the line is detected are 4 x 1016 - 1017/sq cm. Comparison of the C I data with high-sensitivity CO observations shows that the C I and CO emissions have roughly similar spatial distributions. The C I/CO column density ratio is greater than 1, and may be much higher at particular positions of the nebula. The total number of C I atoms in the Ring nebula exceeds that of CO molecules by a factor of about 10. Our observations confirm that the mass of the neutral shell (greater than approximately 0.1 solar mass) exceeds that of the ionized nebula, and indicate that most the neutral gas probably resides in the photo-dissociation regions of rather dense (greater than or approximately 105/cu cm) neutral clumps exposed to the ultraviolet radiation field of the central star.

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