Aperture synthesis mapping of CO (2-1) in IC 342

Details Aperture synthesis mapping of CO (2-1) in IC 342 Aperture synthesis mapping of CO (2-1) in IC 342

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413l..19t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 413, no. 1, p. L19-L22.

Astronomy and Astrophysics

Astrophysics

26

Astronomical Maps, Carbon Monoxide, Spiral Galaxies, Synthetic Apertures, H Ii Regions, Interferometry, Microwave Interferometers, Molecular Clouds, Signal To Noise Ratios

Scientific paper

We present aperture synthesis maps of CO J = 2-1 emission in the central region of the spiral galaxy IC 342. The 3 arcsec resolution maps reveal emission with implied excitation temperatures of 5-30 K. This emission is significantly brighter than the CO (1-0) emission mapped at the same resolution. Since the CO (2-1) emission is likely to be optically thick, the high ratio is probably due to the fact that the CO preferentially traces the outer, warmer cloud layers in externally heated clouds. The locations of the peak values of the CO (2-1)/CO (1-0) intensity ratio appear to occur at the interfaces between regions of high molecular column density and ionized gas. The high SNR of these maps indicates that CO (2-1) will be a powerful tool in the study of dense, warm gas associated with recent star formation in galaxies.

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