Comparative study of the relationships between CO isotopic luminosities and infrared luminosity for the Galactic dense cores  

作　　者：SUN Yan & GAO Yu Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008,China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第6期1169-1178,共10页中国科学：物理学、力学、天文学（英文版）

基　　金：was supported by the National Natural Science Foundation of China (Grant Nos. 10425313,10833006,and 10621303);Chinese Academy of Sciences Hundred Talents Program;the National BasicResearch Program of China (Grant No. 2007CB815406)

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 larger 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.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 larger 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.

关 键 词：ISM molecular CLOUDS radio lines star formation 

分 类 号：P141.2[天文地球—天体物理]