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Observational Study of the Physical Properties of the Hierarchy Commonly Found in Star-Forming Molecular Clouds

恒星形成分子云中常见层次结构物理性质的观测研究

基本信息

批准号：
09640326
负责人：
KITAMURA Yoshimi
金额：
$ 1.34万
依托单位：
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640326/
关键词：
Radio Astronomy Molecular Clouds Star Formation Hierarchy Taurus Ophiuchus Orion IDL

项目摘要

We have made high-quality mapping observations toward the three typical star-forming clouds (Taurus, Orion, and Ophiuchus), in order to investigate the hierachical structure in molecular clouds and its influence on star formation. The Nobeyama 45 m telescope equipped with the 25-beam array receiver system (BEARS) makes it possible to homogeneously cover the spatial ranges from the overall extension (-1 pc) of the clouds down to small scales (-0.01 pc) comparable to cloud cores. Our main results are as follows.1. Development of a new data analysis system (BMAS) for BEARS observations.We have developped a new analysis system (BMAS) for large-scale and high-resolution mapping data with BEARS.We used the programming language, IDL on workstation platforms and BMAS has GUI which is user-friendly. Standard analysis tools in radio astronomy and statistical analysis tools including spectral analysis are built in BMAS.One can efficiently analyze huge data from BEARS with BMAS.2. Dominance of smaller clumps than cores in molecular clouds.We have found that fine structures (clumps) smaller than cores are dominant in molecular clouds by analyzing the BEARS high-quality mapping data with BMAS.The clumps are considered to play an important role in star formation within cloud cores. Furthermore, we found the following new results for individual clouds, In the Taurus cloud, we propose a new classification of protostars based on the spatial distribution of dense gas. In the Orion cloud, there exist fine filaments in the well-known large-scale filamentary structure. And in the Ophiuchus cloud, we revealed the early evolution of star-forming cores by comparing our mapping data with the infrared images taken by ISO.Our analysis is in progress.

我们对三种典型的恒星形成云（金牛座、猎户座和蛇夫座）进行了高质量的测图观测，以研究分子云的层次结构及其对恒星形成的影响。野边山45 m望远镜配备了25光束阵列接收系统（BEARS），可以均匀地覆盖从云的整体延伸（-1 pc）到与云核相当的小尺度（-0.01 pc）的空间范围。主要研究结果如下： 1．开发用于BEARS观测的新数据分析系统（BMAS）。我们与BEARS一起开发了用于大比例尺高分辨率测绘数据的新分析系统（BMAS）。我们在工作站平台上使用编程语言IDL，BMAS具有用户友好的GUI。 BMAS内置了射电天文学的标准分析工具和包括频谱分析在内的统计分析工具。通过BMAS.2可以有效地分析来自BEARS的海量数据。分子云中比核心小的团块占主导地位。通过使用BMAS分析BEARS高质量测绘数据，我们发现分子云中比核心小的精细结构（团块）占主导地位。这些团块被认为在云核心内的恒星形成中发挥着重要作用。此外，我们针对单个云发现了以下新结果：在金牛座云中，我们根据致密气体的空间分布提出了一种新的原恒星分类。在猎户座云中，存在着众所周知的大型丝状结构中的细丝。在蛇夫座云中，我们通过将测绘数据与 ISO 拍摄的红外图像进行比较，揭示了恒星形成核心的早期演化。我们的分析正在进行中。