An Extragalactic 12CO J=3-2 survey with the Heinrich-Hertz-Telescope
Rui-Qing Mao (1,2), Andreas Schulz (3,4), Christian Henkel (2), Rainer, Mauersberger (5), Dirk Muders (2), Dihn-V-Trung (6,7) ((1) Purple Mountain, Observatory, CAS, Nanjing, (2) Max-Planck-Institut fuer Radioastronomie, Bonn, (3) Argelander-Institut fuer Astronomie

TL;DR
This survey of 125 nearby galaxies using the ^{12}CO J=3-2 line reveals variations in molecular gas excitation, with higher ratios in active, starburst, and merging galaxies, indicating diverse molecular gas conditions.
Contribution
First large-scale ^{12}CO J=3-2 survey of nearby galaxies, providing new insights into molecular gas properties across different galaxy types and activity levels.
Findings
Higher R_{31} ratios in active galactic nuclei and starburst galaxies.
No significant correlation of R_{31} with Hubble type or FIR luminosity.
Nuclear CO luminosities correlate with global FIR luminosity, especially in luminous galaxies.
Abstract
We present results of a ^{12}CO J = 3-2 survey of 125 nearby galaxies obtained with the 10-m Heinrich-Hertz-Telescope, with the aim to characterize the properties of warm and dense molecular gas in a large variety of environments. With an angular resolution of 22'', ^{12}CO 3-2 emission was detected in 114 targets. Based on 61 galaxies observed with equal beam sizes the ^{12}CO 3-2/1-0 integrated line intensity ratio R_{31} is found to vary from 0.2 to 1.9, with an average value of 0.81. No correlations are found for R_{31} to Hubble type and far infrared luminosity. Possible indications for a correlation with inclination angle and the 60mum/100mum color temperature of the dust are not significant. Higher R_{31} ratios than in ``normal'' galaxies, hinting at enhanced molecular excitation, may be found in galaxies hosting active galactic nuclei. Even higher average values are determined…
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