Carbon monoxide isotope ratios in galactic centers and disks

Details Carbon monoxide isotope ratios in galactic centers and disks Carbon monoxide isotope ratios in galactic centers and disks

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292l..57r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 292, May 15, 1985, p. L57-L60.

Astronomy and Astrophysics

Astrophysics

57

Abundance, Carbon Monoxide, Galactic Structure, Interstellar Gas, Spiral Galaxies, Hydrogen, Isotopes, Molecular Spectra

Scientific paper

The authors report observations of millimeter-wavelength emission of CO and 13CO in six spiral galaxies, two previously unreported at 13CO. For each galaxy, 13CO emission was observed both from the center and from the disk. The ratio of integrated intensities, P(CO)/P(13CO), varies markedly from galactic center to galactic center, from galactic disk to galactic disk, and from point to point within a given galaxy. These variations indicate that the use of a constant P(CO)→σ(H2) conversion to derive H2 surface densities from extragalactic CO observations can introduce major errors.

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