CO observation of SNR IC 443  

作　　者：ZHANG ZhiYu GAO Yu WANG JunZhi 

机构地区：[1]Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210008,China [2]Graduate University of Chinese Academy of Sciences,Beijing 100080,China [3]Astronomy Department,Nanjing University,Nanjing 210093,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第7期1357-1369,共13页中国科学:物理学、力学、天文学(英文版)

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

摘　　要：We present our 12CO and 13CO mapping observations of SNR IC 443 interacting with molecular clouds.It is the first largescale high-resolution 13CO mapping observation in the surrounding region.The morphologies of IC 443 in 12CO and 13 CO are compared with the optical,infrared,Spitzer far-infrared,X-ray,and neutral atomic gas(HI).We also make comparison and analysis in the kinematics,using the date-cubes of 12CO,13CO and HI,to help distinguish the complicated gas motions in the shocked regions.Based on the work of Wang & Scoville(1992),we present a new model to explain the coexistence of multiple shocks with different speeds in a pc-scale region at the central clump B.We test this new model by analyzing the HI and CO distribution in both velocity and space domain.We also establish the relationship between the dissociation rate of shocked molecular gas and the shock velocity in this region.Finally,we derive the optical depth of 12CO with the 13CO spectra in clump B,and discuss the validity of the assumption of optically thin emission for the shocked 12CO.We present our 12CO and 13CO mapping observations of SNR IC 443 interacting with molecular clouds.It is the first largescale high-resolution 13CO mapping observation in the surrounding region.The morphologies of IC 443 in 12CO and 13 CO are compared with the optical,infrared,Spitzer far-infrared,X-ray,and neutral atomic gas(HI).We also make comparison and analysis in the kinematics,using the date-cubes of 12CO,13CO and HI,to help distinguish the complicated gas motions in the shocked regions.Based on the work of Wang & Scoville(1992),we present a new model to explain the coexistence of multiple shocks with different speeds in a pc-scale region at the central clump B.We test this new model by analyzing the HI and CO distribution in both velocity and space domain.We also establish the relationship between the dissociation rate of shocked molecular gas and the shock velocity in this region.Finally,we derive the optical depth of 12CO with the 13CO spectra in clump B,and discuss the validity of the assumption of optically thin emission for the shocked 12CO.

关 键 词：supernova remnant shock molecular clouds molecular spectrum IC 443 

分 类 号：P145.3[天文地球—天体物理]