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Observations of Interstellar Molecular Clouds

星际分子云的观测

基本信息

批准号：
60302014
负责人：
KAWABATA Kin-aki
金额：
$ 4.8万
依托单位：
Department of Astrophysics, Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60302014/
关键词：
interstellar molecules star formation radio astronomy ミリ波望遠鏡

项目摘要

Fifteen bipolar outflows have been found by unbiased survey employing the 4m millimeter wave telescope at Nagoya and the fine structures of these sources have been observed employing the 45m telescope at Nobeyama. It has been shown that 30-40% of IRAS point sources in the Orion giant molecular cloud and 50-70% of IRAS point sources in dense cores of molecular clouds are associated with molecular flows. IRAS point sources with very low temperature, those accompanied by T Tauri stars, and those with low temperature are located near the center, near the border, and the outside of molecular clouds, respectively. The characteristics can be interpreted by evolution of premain sequence stars. 20 molecular cloud cores have been found in Ophiuchus. <rho> Oph-e shows a double bipolar outflow structure, indicating that cloud cores are produced by interactions of molecular flows with molecular clouds. The star formation efficiency is estimated to be 4% from observations of L1251. Monopolar outflows have been found in five Herbig Be/Ae stars(HES). Two of HES have cavities at the center of bipolar flows. B1 is an intense <C^(18)O> emission source and gravitationally unstable. Polarizations of sixty T Tauri stars and Haro objects have been measured. Frequencies of CCS and CCCS lines have been determined by laboratory experiments and many u-lines have been identified. Developments of SIS mixers and submillimeter wave receivers are reported. Theoretical investigations have been done on various problems such as a relation between the velocity dispersion of stars and giant molecular clouds, formation of filaments by fragmentation of a giant molecular cloud due to gravitational instabilities, MHD models of bipolar outflows, interactions of interstellar matter and stellar wind, and so on.

在名古屋用4米毫米波望远镜进行的无偏观测发现了15个两极外流，用野山的45米望远镜观测到了这些源的精细结构。研究表明，猎户座巨型分子云中IRAS点源的30-40%和分子云密核中IRAS点源的50-70%与分子流有关。IRAS极低温点源、T-金牛星伴星点源和低温IRAS点源分别位于分子云中心附近、边界附近和外部。这种特征可以用前主序列星的演化来解释。蛇夫座已发现20个分子云核。&lt；Rho&gt；Oph-e呈现双两极流出结构，表明云核是由分子流与分子云相互作用形成的。根据L1251的观测，恒星形成效率估计为4%。在5颗HerBig Be/Ae星(HES)中发现了单极外流。其中两个HES在两极流动的中心有空穴。B1是一个强烈的&lt；C^(18)O&gt；发射源，引力不稳定。测量了60颗T金牛座恒星和HARO天体的偏振。已通过实验室实验确定了CCS和CCCS系的频率，并鉴定了许多U-线。报道了SIS混频器和亚毫米波接收机的发展。对恒星的速度色散与巨型分子云的关系、引力不稳定性引起的巨型分子云碎裂形成细丝、双极外流的MHD模型、星际物质与星际风的相互作用等问题进行了理论研究。