Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380..392s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 20, 1991, p. 392-402.
Astronomy and Astrophysics
Astrophysics
21
Molecular Clouds, Spiral Galaxies, Star Formation, Carbon Monoxide, Emission Spectra, Galactic Nuclei, Galactic Rotation, Massive Stars
Scientific paper
This paper presents an almost fully sampled map, at 45-arcsec resolution, of CO J = 1-0-emission from the inner 3 arcmin of IC 342, along with sparse observations out to 10 arcmin from the center. The CO emission is found to be centrally concentrated. CO is enhanced near the spiral arms but is observed over the whole map. The CO emission is strongest from the nuclear region, which extends 1.5 kpc from the center. Spectra with very good signal-to-noise are used to determine the inner rotation curve of IC 342. The region of solid body rotation is found to extend about 1.7 kpc from the center, much less than the previously reported 5 kpc. The efficiency of massive star formation in the nuclear region, determined from the ratio of far-infrared luminosity to molecular mass, is found to be only slightly lower than the Galactic region W49, and it approaches values seen in strongly interacting and merging galaxies. It is suggested that the efficiency of star formation near the centers of most spiral galaxies is much greater than in the disks and may be related to the presence of large quantities of dense gas.
Sage Leslie J.
Solomon Philip M.
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