Heterogenous array observations of IC 342 - The CO isotopic ratio

Details Heterogenous array observations of IC 342 - The CO isotopic ratio Heterogenous array observations of IC 342 - The CO isotopic ratio

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..470w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 470-476.

Astronomy and Astrophysics

Astrophysics

23

Carbon Monoxide, Carbon 12, Carbon 13, Spiral Galaxies, Star Formation, Density Wave Model, H Alpha Line, Molecular Clouds

Scientific paper

Images of the (C-13)O and (C-12)O = 1-0 emission from the nuclear region of the galaxy IC 342 with 3-arcsec resolution are presented. The images were obtained by combining data from the BIMA, OVRO, and Nobeyama millimeter arrays. Within the central arcminute, the molecular gas forms two spiral features with a number of prominent peaks which are also seen in HCN emission. The (C-12)O/(C-13)O line ratio varies from 3 to 24 with peaks at the position of the thermal continuum where the gas is heated by the star formation, and further out in the spiral features where the gas density is reduced. The molecular emission peaks corresond to molecular clouds with diameters 20-50 pc, masses of about 10 exp 6 solar masses, and a (C-12)O/(C-13)O ratio of about 5.

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