Abstract

Contributed Talk - Splinter MassiveStars

Monday, 09 September 2024, 15:15   (S23)

From ASHES to ASSEMBLE: A Dynamic View of Massive Protocluster Formation and Evolution

Fengwei Xu, Ke Wang, Tie Liu
1. Kavli Institute for Astronomy and Astrophysics. 2. I. Physikalisches Institut, Universität zu Köln

Massive stars form in massive protocluster, but the process of stellar mass assembly including fragmentation and accretion remains poorly understood. Thanks to the high resolution, sensitivity, and wide frequency coverage of the Atacama Large Millimeter/submillimeter Array (ALMA), we can now make surveys of massive protoclusters in great detail. With the project ASSEMBLE, we resolved 11 massive protoclusters with 0.01 pc resolution. A total of 248 dense cores have been identified and physical properties including temperature, mass, and density have been derived. By comparing them with those at an early evolutionary stage, we found as a massive protocluster evolves, it becomes tighter and its members become more massive and denser. Besides, the mass correlation between the massive cores and their parental clumps is built, possibly due to the continuous mass accretion. The systematically identified primordial mass segregation shed light on the long-term questions of the origin of mass segregation in stellar clusters. Our results have been and will be supported by a much larger sample like QUARKS and ALMAGAL.