Distributions of (C-13)O emission in the disks of late-type spiral galaxies

Details Distributions of (C-13)O emission in the disks of late-type spiral galaxies Distributions of (C-13)O emission in the disks of late-type spiral galaxies

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..680y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 15, 1986, p. 680-692. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

85

Abundance, Carbon Monoxide, Galactic Structure, Interstellar Gas, Molecular Clouds, Spiral Galaxies, Metallicity, Molecular Spectra, Optical Thickness

Scientific paper

The authors have observed the radial distributions of 13CO and 12CO emission in six late-type spiral galaxies using the 14 m millimeter telescope of the FCRAO (HPBW = 45arcsec). Emission from the 13CO molecule was detected at a total of 27 out of 32 positions observed in these galaxies, out to radii of 4 - 5 kpc in IC 342, NGC 6946, and M83, and out to 5 - 7 kpc in NGC 1068, NGC 4321, and M51. Each of the galaxies shows the highest 13CO integrated intensity in the center. The mean 12CO/13CO integrated intensity ratio, R, in the six galactic centers is 11.0. The global mean value of this ratio for each galaxy ranges between 8.3±2.0 and 14.7±2.0, with the higher value found in NGC 1068 and the lower values in NGC 4321 and IC 342. There is strong evidence that R is higher in galaxies with higher dust temperatures. The values of R in the external galaxies closer than 10 Mpc show greater than 3 σ variations at adjacent positions, corresponding to size scales of 1 - 2 kpc; these variations are similar to those seen in the disk of the Milky Way.

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