12CO(1-0) and 12CO(2-1) mapping of gas complexes in the spiral galaxy NGC 6946 - Comparison with H I and H II regions

Details 12CO(1-0) and 12CO(2-1) mapping of gas complexes in the spiral galaxy NGC 6946 - Comparison with H I and H II regions 12CO(1-0) and 12CO(2-1) mapping of gas complexes in the spiral galaxy NGC 6946 - Comparison with H I and H II regions

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..357c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 2, July 1990, p. 357-371.

Astronomy and Astrophysics

Astrophysics

46

Astronomical Spectroscopy, Carbon Monoxide, H I Regions, H Ii Regions, Interstellar Matter, Spiral Galaxies, Cosmic Gases, Disk Galaxies, Molecular Clouds, Telescopes

Scientific paper

Observations of 12CO(1-0) and 12CO(2-1) found in the disk of the Scd galaxy NGC 6946 are presented. These observations were performed with the IRAM 30-m telescope. The ratio of the CO(2-1) to CO(1-0) emissivities amounted to about 0.4, which is characteristic of a low-excitation state. It is suggested that the CO lines observed at a scale of 500 pc are mainly emitted in the low-density optically thick envelopes of molecular clouds.

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