Observations of CO emission from the nucleus of NGC 4945

Details Observations of CO emission from the nucleus of NGC 4945 Observations of CO emission from the nucleus of NGC 4945

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...231...25w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 231, no. 1, May 1990, p. 25-29.

Astronomy and Astrophysics

Astrophysics

28

Active Galactic Nuclei, Carbon Monoxide, Emission Spectra, Molecular Clouds, Molecular Gases, Extragalactic Radio Sources, Stellar Spectrophotometry

Scientific paper

Observations, using SEST (with a beamwidth of 43 arcsec), of the J = 1-0 transition of CO toward the edge-on spiral galaxy NGC 4945 have revealed a well-defined molecular cloud complex near the nucleus. The distribution of this complex is consistent with a rotating disk, of diameter 1100 pc and thickness 500 pc, surrounding a smaller nuclear radio source. The velocity range in the complex is 340-780 km/s. Much of the complex, including two concentric molecular rings, is rotating systematically. However, nonrotation motions are probably also present. An observed (C-12)O/(C-13)O line intensity ratio of 16 is used to derive a molecular column density of 7 x 10 to the 22nd/sq cm and a total mass of 1.3 x 10 to the 8th solar masses.

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