A search for evidence of small-scale inhomogeneities in dense cores from line profile analysis  

作　　者：Lev Pirogov 

机构地区：[1]Institute of Applied Physics, Russian Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2018年第8期97-102,共6页天文和天体物理学研究（英文版）

基　　金：support of the RFBR grants(projects 15–02–06098,16–02–00761 and18–02–00660);support of the Russian Science Foundation grant(project 17–12–01256)

摘　　要：In order to search for intensity fluctuations on the HCN（1-0） and HCO＋（1-0） line pro- files, which could arise due to possible small-scale inhomogeneous structure, long-term observations of high-mass star-forming cores S140 and S199 were carried out. The data were processed by the Fourier filtering method. Line temperature fluctuations that exceed the noise level were detected. Assuming the cores consist of a large number of randomly moving small thermal fragments, the total number of frag- ments is - 4 × 106 for the region with linear size - 0.1 pc in S140 and - 106 for the region with linear size - 0.3 pc in S 199. Physical parameters of fragments in S 140 were obtained from detailed modeling of the HCN emission in the framework of the clumpy cloud model.In order to search for intensity fluctuations on the HCN（1-0） and HCO＋（1-0） line pro- files, which could arise due to possible small-scale inhomogeneous structure, long-term observations of high-mass star-forming cores S140 and S199 were carried out. The data were processed by the Fourier filtering method. Line temperature fluctuations that exceed the noise level were detected. Assuming the cores consist of a large number of randomly moving small thermal fragments, the total number of frag- ments is - 4 × 106 for the region with linear size - 0.1 pc in S140 and - 106 for the region with linear size - 0.3 pc in S 199. Physical parameters of fragments in S 140 were obtained from detailed modeling of the HCN emission in the framework of the clumpy cloud model.

关 键 词：LINES profiles - molecular data - methods data analysis - ISM clouds - ISM molecules - ISM structure - ISM individual objects （S 140） 

分 类 号：P152[天文地球—天文学]