NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-24 T03:15:36 PDT
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For refcode 1999A&A...341..256M:
Retrieve 29 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1999A&A...341..256M Dense gas in nearby galaxies. XII. A survey for CO J=3-2 emission. MAUERSBERGER R., HENKEL C., WALSH W., SCHULZ A. Received 27 July 1998/Accepted 18 September 1998 Abstract: The J=3-2 sub-mm line of ^12^CO has been observed with the Heinrich-Hertz-Telescope (HHT) toward a sample of 28 nearby galaxies, and toward Arp 220. All sources are detected. This is the largest extragalactic sample of CO 3-2 spectra published so far. The 3-2 line fluxes, I32, are compared to 1-0 and 2-1 fluxes measured with the IRAM 30-m telescope. Model calculations show that the I_32_/I_10_ ratio can be used as a measure of the average H_2_ density. For most sources observed, I_32_/I_10_ is in the range 0.2-0.7, which is predicted if kinetic temperatures are <50K and/or H_2_ densities <1000 cm^-3^. Our measurements of the J=1-0, 2-1, and 3-2 lines toward M 82 do not support earlier claims of 2-1/1-0 line ratios much larger than 1. As in other active galaxies (NGC 253, Arp 220) the measured line intensity ratio is close to unity. Unlike single dish data from the lower excited CO lines, the CO 3-2 profile toward Arp 220 shows two velocity components, possibly arising from the edges of its molecular disk. Key words: radio lines: galaxies - galaxies: spiral - galaxies: ISM - galaxies: general - ISM: molecules - surveys
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