Deducing a molecular ring structure in the nucleus of NGC 4945 from CO line profiles

Details Deducing a molecular ring structure in the nucleus of NGC 4945 from CO line profiles Deducing a molecular ring structure in the nucleus of NGC 4945 from CO line profiles

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..403b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. 403-412.

Astronomy and Astrophysics

Astrophysics

38

Carbon Monoxide, Galactic Nuclei, Galactic Structure, Line Spectra, Molecular Clouds, Spiral Galaxies, Astronomical Models, Carbon 13, Far Infrared Radiation, Signal To Noise Ratios

Scientific paper

The Swedish-ESO Submillimeter Telescope was used to obtain high-SNR spectra of the C-12O and C-13O J = 1-0 transitions in the central position of the almost edge-on spiral galaxy NGC 4945. A spectrum of the CS J = 2-1 line and an upper limit on the strength of the CS J = 5-4 transition were also obtained. A model is presented in which the molecular clouds are distributed in a thick circumnuclear ring of mean radius 220 pc and thickness 200 pc. This model reproduces the observed intensity ratio profile in C-12O/C-13O and suggests that its structure is due to path-length variations, and thus to varying amounts of cloud shielding, over the almost edge-on ring.

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