银河系致密核CO同位素光度与红外光度关系的比较研究
Comparative study of the relationships between CO isotopic luminosities and infrared luminosity for the Galactic dense cores
摘要：
结合12 CO（1-0）、13 CO（1-0）和C18 O（1-0）数据和IRAS四波段数据，本文估算了来自两个已发表的CO样品的29个致密分子云的物理参数，如大小、病毒质量、COJ =1-0同位素和红外光度。我们进一步分析了CO J=1-0同位素光度与红外光度（恒星形成率，SFR）之间的各种相关性，并讨论了分子气体示踪物与SFR之间的关系。结果表明，12 CO（1-0）、13 CO（1-0）和C18 O（1-0）的光度值之间有较强的相关性。CO J=1-0同位素光度和SFR的相关性较弱，散射比银河系47个致密核和65个外部恒星形成星系的HCN-IR相关性大。这可能是因为SFR和恒星形成效率主要取决于高体积密度下的分子气体，而不是高柱密度。
英文摘要：
Combining the 12CO(1-0), 13CO(1-0), and C18O(1-0) data with IRAS four band data, we here estimate the physical parameters such as size, viral mass, and CO J=1-0 isotopic and infrared luminosities for 29 dense molecular clouds from two published CO samples. We further analyze the various correlations between CO J=1-0 isotopic luminosities and infrared luminosity (star formation rate, SFR) and discuss the relationships between the molecular gas tracers and SFR. The results show that 12CO(1-0), 13CO(1-0) and C18O(1-0) luminosities have tight correlations with each other. CO J=1-0 isotopic luminosities and SFR show weak correlations with lager scatter than the HCN-IR correlations of 47 dense cores in the Galaxy and 65 external star-forming galaxies. This might be interpreted as that both the SFR and star formation efficiency are mainly determined by the molecular gas at high volume density rather than high column density.
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