The ALMA-ATOMS/QUARKS survey: what we have learned about the formation and evolution of high-mass proto-clusters
by
Host: Dong Lai
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Abstract:
As primary sources of heavy elements and ultraviolet (UV) radiation, high-mass stars dominate the evolutionary processes of galaxies. Nevertheless, their formation and evolutionary mechanisms remain poorly understood. To conduct a statistical investigation of high-mass star formation in the Milky Way, we have launched the ALMA-ATOMS/QUARKS survey using the Atacama Large Millimeter/submillimeter Array (ALMA). This program has observed approximately 140 high-mass proto-clusters in Band 3 and Band 6, achieving an angular resolution of ~0.3 arcseconds. The key scientific objectives of the ALMA-ATOMS/QUARKS survey are: (i) to advance our understanding of the dense gas star formation law by characterizing the spatial distributions of diverse dense gas tracers in a large sample of Galactic clumps and quantifying the fraction of molecular gas involved in star formation; (ii) to explore how stellar feedback from newly formed OB (proto)stars shapes the surrounding gas distribution and modulates subsequent star formation within their host clumps; (iii) to resolve filamentary structures and elucidate their fundamental roles in proto-cluster assembly; and (iv) to search for massive protostellar disks and investigate the multi-scale gas accretion mechanisms that govern protostellar mass growth; and so on. In this talk, I will present the current progress of this survey and outline its future observational and analytical plans.
Biography:
Dr. Tie Liu received his PhD degree from Peking University in 2013. Subsequently, he pursued research careers in Chile, South Korea and the United States as KASI Fellow and EACOA Fellow. He returned to China and joined the Shanghai Astronomical Observatory in September 2019, where he has served as an Associate Researcher and then a Researcher professor. Currently, he presides over a number of key scientific research projects, including the National Key R&D Program of China. His research primarily focuses on observational studies of ISM and star formation in the Milky Way using world-class large radio telescopes, such as ALMA, SMA, JCMT, NRO 45-m, and FAST. As the Principal Investigator (PI), he has led several large international collaborative observational projects, including JCMT-SCOPE, ALMA-ATOMS/QUARKS, and ALMASOP.
