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The channel Maps and the Position-Velocity diagrams of multi-core structure of cepheus c

天文研究与技术 1999年第S1期 218-221页

作者： Yu Zhi yao 1,2 , Jiang Dong rong 1,2 1 (Shanghai Astronomical Observatory, The chinese Academy of Sciences, Shanghai 200030, china) 2 (National Astronomical Observatories, The chinese Academy of Sciences, china E mail: zyyu@center. shao. ac.

The first important problem in the star forming process is the formation of proto star core in star forming regions of molecular cloud. The multi core structure in star forming regions is related to the forming of proto star core. The molecular radiation of c 18 O( J = 1-0) in cepheus c has been observed. The c 18 O( J = 1-0) observations form the basis for an interesting study on the cloud cores and star formation activity in the cores of the cepheus c. In order to study the multi core structure of c 18 O( J = 1-0) in the cepheus c the channel maps and the position velocity diagrams of c 18 O( J = 1-0) will be shown. From the maps it is found that the contour level and distribution size of the three cores in cepheus c are related to the channel velocity very much. The channel velocity of c 18 O( J = 1-0) molecules in core b, which distributed in all the channels velocity, is different with one in core a and core c very much. The c 18 O( J = 1-0) molecules in core a and core c of the cepheus c mostly distributed in the blue shifted channel velocity relating to peak velocity, and only in -10.0 ～ -9.5 km/s, which is the red shifted channel velocity relating to peak velocity. And the contour level of c 18 O( J = 1-0) in -10.0 ～ -9.5 km/s is small and the distrbution size in the channel map is small. According to the position velocity diagrams the asymmetry of the distribution both blue shifted and red shifted components should reflect the asymmetry of the profile. From the diagrams it also is found that the contour level and the distribution size of the three cores are different from each other. Both results from the maps and diagrams are coincident with each other.

关键词： Maps The channel Maps and the Position-Velocity core diagrams of multi-core structure of cepheus c

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