Radial Distributions of the HCN/CO Ratio in Nearby CO Bright Galaxies

Details Radial Distributions of the HCN/CO Ratio in Nearby CO Bright Galaxies Radial Distributions of the HCN/CO Ratio in Nearby CO Bright Galaxies

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54..179s&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.54, No.2, pp.179-194

Astronomy and Astrophysics

Astronomy

18

Galaxies: Individual (Maffei 2, Ic 342, Ngc 2146, M 82, M 51, Ngc 6946), Galaxies: Ism, Galaxies: Nuclei, Galaxies: Starburst, Ism: Molecules

Scientific paper

Simultaneous observations of HCN and CO lines were made along the major axes of six nearby CO bright galaxies with the Nobeyama 45-m telescope. The beam-averaged HCN/CO ratios are 0.01 to 0.1. The distributions of the HCN/CO ratio along the major axes (and the minor axis for M51) show different patterns from one galaxy to another. By adding data obtained from the outer disk, however, we found gradual decreases in the HCN and CO intensities and the HCN/CO ratio with increasing radius in M51 from the nuclear region to 3kpc, similar to our previous result for NGC253. The HCN/CO ratio is very sensitive to the observing beam size on a linear scale. The ratio, which reflects the fraction of dense molecular gas, correlates with the star-formation activity derived from the far-infrared luminosity.

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