Low spatial resolution observations of C3H2 in H II regions and dark clouds

Details Low spatial resolution observations of C3H2 in H II regions and dark clouds Low spatial resolution observations of C3H2 in H II regions and dark clouds

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...199..312b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 199, no. 1-2, June 1988, p. 312-317.

Astronomy and Astrophysics

Astrophysics

4

Cyanoacetylene, Cyclic Hydrocarbons, H Ii Regions, Interstellar Matter, Molecular Clouds, Spatial Resolution, Carbon Monoxide, Interstellar Extinction, Molecular Structure

Scientific paper

The J = 212-101 transition of ortho-C3H2, the first hydrocarbon ring identified in space, has been observed with the 2.5 m millimeter-wave telescope of the Bordeaux Observatory (beamwidth ≡5arcmin.8) towards a variety of H II regions and dark clouds. Twenty four sources have been detected. The linewidths and antenna temperatures (corrected for outside the atmosphere) lie in the range 0.35 to 4.2 km s-1 and 0.12 to 0.60K respectively. The authors' low spatial resolution maps show that C3H2 is not strongly peaked and may extend over tens of arc minutes in dark clouds, although it is known from large antenna observations that C3H2 presents a clumpy structure. The J = 10-9 transition of HC3N was also observed with the Bordeaux telescope in twenty dark clouds. The authors' observations and the published literature suggest that C3H2 and carbon chain molecules are formed in the same regions, in agreement with the theory suggesting a common precursor to both C3H2 and cyanopolyynes.

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