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

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2018,（8）
• 页码范围: 97-102
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-4527/18/8/100

摘要

In order to search for intensity fluctuations on the HCN(1-0) and HCO+(1-0) line profiles,which could arise due to possible small-scale inhomogeneous structure,long-term observations of high-mass star-forming cores S 140 and S 199 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 fragments 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.