NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T12:23:23 PDT
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For refcode 2010PASJ...62..409M:
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Copyright by Astronomical Society of Japan. 2010PASJ...62..409M Dense and Warm Molecular Gas and Warm Dust in Nearby Galaxies Matsushita, Satoki; Kawabe, Ryohei; Kohno, Kotaro; Tosaki, Tomoka; Vila-Vilaro, Baltasar Abstract. We performed ^12^CO (1-0), ^13^CO (1-0), and HCN (1-0) single-dish observations (beam size ~14-18) toward nearby starburst and non-starburst galaxies using the Nobeyama 45-m telescope. The ^13^CO (1-0) and HCN (1-0) emissions were detected from all seven starburst galaxies, with the intensities of both lines being similar (i.e., the ratios are around unity). On the other hand, for the case of non-starburst galaxies, ^13^CO (1-0) emission was detected from all three galaxies, while HCN (1-0) emission was weak, or not detected in past observations. This result indicates that the HCN/^13^CO intensity ratios are significantly larger (~1.15+/-0.32) in the starburst galaxy samples than the non-starburst galaxy samples (<0.31+/-0.14). The large-velocity-gradient model suggests that the molecular gas in the starburst galaxies has warmer and denser conditions than that in the non-starburst galaxies, and the photon-dominated-region model suggests that denser molecular gas is irradiated by a stronger interstellar radiation field in starburst galaxies than that in non-starburst galaxies. In addition, HCN/^13^CO ratios in our sample galaxies exhibit strong correlations with the IRAS 25 micron flux ratios. It is a well-established fact that there exists a strong correlation between dense molecular gas and star-formation activities, but our results suggest that the molecular gas temperature is also an important parameter. Key words: galaxies: ISM, galaxies: nuclei, galaxies: starburst, ISM: molecules
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