A Study of the Southern Star Formation with a 4m Radio Telescope

用4m射电望远镜研究南方恒星的形成

• 批准号: 10044076
• 负责人: FUKUI Yasuo
• 金额: $ 6.72万
• 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: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044076/
• 关键词: Interstellar Molecular Clouds; Southern Sky; Supernova Remnant; Radio Astronomy; Magellanic Clouds; Star Formation 10; 星間分子雲

The interstellar molecular cloud is one of the most important astronomical objects to study the formation of stars and stellar clusters and evolution of galaxies. Through this program, we obtained many new views of molecular clouds in the southern sky. In the following, we summarize a part of the results.1. Discovery of molecular super-shell candidates : We have found 〜15 candidates of molecular super-shell similar to "Carina Flare", a huge super-shell formed by 〜20 of supernova explosions. In the Centaurus region, the shell-candidates show good spatial correlation with the massive star forming regions. This observationally indicates that the supernova explosion plays an important role in recycling the interstellar matter between the galactic plane and halo as theoretical astronomers suggested.2. Detailed study of molecular gas in the Vela supernova remnant (SNR) : We made detailed observation of molecular gas toward the nearest SNR, Vela SNR. The CO intensity distribution shows good correlation with those of X-ray, optical emission, and HI emission, suggesting that the interaction between the SNR and molecular gas occurs in many places in the SNR. This result has an impact on the study of the evolution of SNRs and physical process of the ionized shock front.Discovery of small molecular clouds associated with the super giant shell in the LMC : We identified many molecular clouds with 10ィイD15ィエD1 solar-masses associated with the super giant shell, LMC4 and 5 in the LMC. Stellar clusters and HII regions tend to be located on the side facing to the shell in those small clouds. In addition, between the LMC 4 and 5, there are massive clouds having 10ィイD16ィエD1 solar-masses. These results suggest that most of the newly identified clouds are formed as a result of compression by the expanding shell, leading to form stars in them, and that the shell itself grows by the supernova explosions of the newly formed stars.

星际分子云是研究恒星和星团形成以及星系演化最重要的天文物体之一。通过这个计划，我们获得了南方天空分子云的许多新视图。下面对部分结果进行总结： 1．候选分子超壳层的发现：我们发现了〜15个候选分子超壳层，类似于“船底座耀斑”，这是由〜20次超新星爆炸形成的巨大超级壳层。在半人马座区域，候选壳层与大质量恒星形成区域表现出良好的空间相关性。这从观测上表明，正如理论天文学家所认为的那样，超新星爆炸对于银道面和晕之间的星际物质循环发挥着重要作用。 2．船帆座超新星遗迹（SNR）中分子气体的详细研究：我们对最接近的 SNR（船帆座 SNR）的分子气体进行了详细观察。 CO强度分布与X射线、光学发射和HI发射的强度分布表现出良好的相关性，表明SNR和分子气体之间的相互作用发生在SNR中的许多地方。这一结果对电离激波锋面的信噪比演化和物理过程的研究有影响。 与大麦哲伦超巨壳层相关的小分子云的发现：我们识别出许多与大麦哲伦超巨壳层LMC4和5相关的分子云，其质量为10ィイD15ィD1个太阳质量。星团和HII区域往往位于那些小云中面向壳层的一侧。此外，在 LMC 4 和 5 之间，存在着具有 10ィイD16ィD1 个太阳质量的大量云。这些结果表明，大多数新发现的云是由于膨胀的壳层压缩而形成的，导致其中形成恒星，而壳层本身是通过新形成的恒星的超新星爆炸而生长的。

项目成果

A.Mizuno: "A ^<13>CO(J=1-0) Search for Small Molecular Clouds toward the Chamaeleon-Musca Dark Cloud Complex" Astrophysical Journal Letters. v.507. 83-87 (1998)

A.Mizuno：“A ^<13>CO(J=1-0) 向 Chamaeleon-Musca 暗云复合体搜索小分子云”天体物理学期刊快报。

Y. Yonekura: "NANTEN Observations of Dense Cores in the Corona Australis Molecular Cloud"PASJ. 51. 911-918 (1999)

Y. Yonekura：“南天对澳大利亚日冕分子云致密核心的观测”PASJ。

A. Mizuno: "Dense cores and star-formation activities in the Chamaeleon dark could complex"PASJ. 51. 859-870 (1999)

A. Mizuno：“变色龙黑暗中的致密核心和恒星形成活动可能会复杂”PASJ。

Y. Fukui: "Discovery of the Carina Flare with NANTEN ; Evidence for a Supershell That Triggered the Formation of Stars and Massive Molecular Clouds"PASJ. 51. 751-764 (1999)

Y. Fukui：“与 NANTEN 一起发现船底座耀斑；触发恒星和大量分子云形成的超级壳层的证据”PASJ。

T.Hayakawa: "A New Derivation of the Extinction-to-CO Column Density Radio in the Chamaeleon I Dark Cloud"」. 51. 919-929 (1999)

T.Hayakawa：“Chamaeleon I 暗云中消光到 CO 柱密度射电的新推导”51. 919-929 (1999)。