星間分子雲において形成される星の最大質量の観測的研究

星际分子云中形成的恒星最大质量的观测研究

• 批准号: 07404008
• 负责人: FUKUI Yasuo
• 金额: $ 23.74万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07404008/
• 关键词: Radio astronomy; Star formation; Molecular cloud; 星間分子雲; 星間分子スペクトル

Studies of star formation have been made mostly as detailed ones for individual star forming regions. This kind of study tends to be done on "famous" star forming regions like Orion KL region. It is however crucially important to ask how the properties derived by such studies are ubiquitous among other regions of star formation. We need to be critical in using these results or extending the conclusions obtained to star forming regions in general. The present study aims at understanding the trend of star formation, or the general rule in star formation by carrying out an extensive survey of molecular clouds, star forming regions, with two 4-m radio telscopes equipped with the world-best superconducting receivers developed at Nagoya University.The major conclusions are summarized as follows ;1.The cloud mass spectrum is well represented as a power law of an index of 1.7.2.There is no significant correlation between the cloud mass and the spectral linewidth.3.The protostars formed in the individual clouds obeys a power law of luminosity with an index of-1,3, as is consistent with previously known Initial Mass Functions of ordinary stars.4.The maximum stellar luminosity formed in a cloud of a given mass is proportional to the 1,4-th power of the parent cloud mass.4.Star formation activity is correlated with the ratio of virial mass and LTE mass of a cloud. This trend is naturally understood as indicating that a cloud slowly contracts to for stars through dissipation of the internal turbulent motion.

对星星形成的研究大多是对单个星星形成区的详细研究。这种研究往往是在“著名”的星星形成区，如猎户座KL区。然而，至关重要的是要问，这些研究得出的性质如何在其他星星形成区域普遍存在。我们在使用这些结果或将得到的结论推广到一般的星星形成区时，需要严格把关。本研究利用名古屋大学研制的两台4米射电望远镜，配备了世界上最先进的超导接收机，对星星形成区--分子云进行了广泛的观测，旨在了解星星形成的趋势，或星星形成的一般规律。1.云的质量谱很好地表现为指数为1.7.2的幂律。云质量与谱线宽度之间没有显着的相关性。3.单个云中形成的原恒星服从指数为-1，3的光度幂律。4.恒星形成活动与云的维里质量和LTE质量的比值有关。这种趋势很自然地被理解为云通过内部湍流运动的消散而缓慢地收缩以形成恒星。

项目成果

T.Handa et al.: ""Detection of a Cricumstellar Gas around DMTau ; A Protoplancetary Disk around a Single Star"" Astrophys.J.449. 894-899 (1995)

T.Handa 等人：“检测到 DMTau 周围的 Cricumstellar 气体；

K.Dobashi: ""Molecular clouds in Cignus. II. Statistical studies of star forming regions"" Astrophys. J. 466. 282-295 (1996)

K.Dobashi：“西格努斯的分子云。

A.Abergel: ""For IR and CO (J=1-0) large scale emissions of the Taurus complex"" Astrophys. J. Suppl.111. 483-491 (1995)

A.Abergel：“金牛座复合体的红外和二氧化碳 (J=1-0) 大规模排放”天体物理学。

Zhi-Yao: ""The New Observation of C^<18>O (J=1-0) Molecular Emission in the Cepheus OB3 Molecular Cloud"" Astrophys. J. 471. 867-870 (1996)

志尧：“仙王座OB3分子云中C^18O(J=1-0)分子发射的新观察”天体物理学。

T.Nagahama et al.: ""A Spatially Complete 13COJ=1-0 Survey of the Orion A Cloud"" Astrophys.J.(submitted). (1997)

T.Nagahama 等人：“猎户座 A 云的空间完整 13COJ=1-0 勘测”Astrophys.J.（已提交）。