【学术报告】 

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  报告题目: ALMA observations of star forming massive clouds in the Milky Way: from filaments in the Galactic disk to massive quiescent clouds around the Galactic Center

报告人: 吕行 副研究员

报告人单位: 中国科学院上海天文台

报告时间: 2022年1月7日 上午10:00-11:30

报告地点: 行政楼112会议室

报告语言: 中文

报告摘要:

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Abstract:Star formation is fundamental to all fields of astrophysics; however, there are still many unsettled questions even for star formation in our own Galaxy. I will introduce our recent results about star formation in two different environments in the Galaxy, including filamentary clouds in the Galactic disk and massive molecular clouds in the Central Molecular Zone around the Galactic Center, by using data from my PI ALMA projects. In the filamentary clouds, we focus on gas fragmentation and accretion. We have resolved the clouds into hundreds of 0.01-pc scale condensations and detected signatures of star formation including outflows, hot molecular cores, HII regions, and masers. In the Central Molecular Zone clouds, we set out to explain their low star formation efficiency and find that the root must be related to microscopic physical conditions in pc-scale clouds, while star formation within 0.1-pc scale dense cores proceeds as normal. Finally, I attempt to compare star formation properties in these two environments, including the core mass function, protostellar disk properties, and shock chemistry, and suggest that we can use the results to explain similar variations of star formation efficiencies in external galaxies.

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12月24日

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