Abstract
view Abstract Citations (29) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Aperture Synthesis Mapping of CO (2--1) in IC 342 Turner, Jean L. ; Hurt, Robert L. ; Hudson, David Y. Abstract We present aperture synthesis maps of CO J = 2-1 emission in the central region of the spiral galaxy IC 342. The 3" 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 signal to noise 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. Publication: The Astrophysical Journal Pub Date: August 1993 DOI: 10.1086/186949 Bibcode: 1993ApJ...413L..19T Keywords: Astronomical Maps; Carbon Monoxide; Spiral Galaxies; Synthetic Apertures; H Ii Regions; Interferometry; Microwave Interferometers; Molecular Clouds; Signal To Noise Ratios; Astrophysics; GALAXIES: INDIVIDUAL ALPHANUMERIC: IC 342; GALAXIES: NUCLEI; GALAXIES: SPIRAL; GALAXIES: STARBURST; RADIO LINES: GALAXIES full text sources ADS | data products SIMBAD (2) NED (1)
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