发稿时间:2020-11-16浏览次数:259

USTC Astronomy Colloquium Series: 2020 Fall
Observational studies of star formation in the Milky Way with ALMA
刘铁  博士
上海天文台
2020/11/17, 4:00pm , the 19th-floor Observatory Hall
报告人:
Dr. Tie Liu is an observational radio astronomer at Shanghai Astronomical Observatory (SHAO) with expertise on (sub)millimeter observations with both single dishes (e.g., JCMT) and interferometers (e.g. ALMA). He obtained his PhD at Peking University in 2013. After that, he did postdoc studies in Chile, South Korea (KASI) and US (EAO). Since September 2019, he worked at SHAO as an associate professor. His main research interests are focused on star formation in Milky Way clouds. Dr. Liu currently serves as the principle investigators (PI) of several survey programs at the JCMT 15-m telescope, TRAO 14-m radio telescope and The Atacama Large Millimeter/submillimeter Array (ALMA). Currently he also serves as a member of the Time Allocation Committee (TAC) for the JCMT 15-m telescope and the FAST 500-m telescope.
摘要:
Stars form in the densest parts of molecular clouds, called dense cores. However, it is stillunclear how dense cores fragment and collapse to form single stars or multiple stellarsystems. To deepen our understandings of star formation in our Galaxy, we have initiatedtwo survey-type programs at ALMA, ALMASOP and ATOMS. In ALMASOP (ALMA Survey of Orion PGCCs), we observed 72 low-mass cold dense cores in Orion complex with extremely high resolution (~100 au) to systematically investigate the fragmentation of starless cores and early evolution of protostellar objects. The ATOMS, standing for ALMA Three-millimeter Observations of Massive Star-forming regions, survey has observed 146 active star-forming regions with ALMA band 3, aiming to systematically investigate the spatial distribution of various dense gas tracers in a large sample of Galactic massive clumps, to study the roles of stellar feedback in star formation, and tocharacterize filamentary structures inside massive clumps. In this talk, I will introduce thepresent status and future plans for these two projects.