Online-Colloquium: Dr. Thushara Pillai (Institute for Astrophysical Research, Boston; MPI für Radioastronomie, Bonn)
Wann: Mi, 14.04.2021, 15:00 Uhr
Early High-Mass Star Formation: A comprehensive Atlas with ALMA and SOFIA
High–mass stars are cosmic engines known to dominate the energetics in the Milky Way and other galaxies. However, they are very rare and their formation is still not well understood. High-mass, cold, dense clouds are the nurseries of high-mass stars. I will show how high-mass cloud studies have started to reveal the initial conditions for high–mass star formation (HMSF). One part of my talk will focus on a large systematic search for Cold Cores with ALMA (CoCoA). With a survey machine like ALMA, CoCoA aims to reveal the truly high-mass starless cores if they exist.
No measurements of magnetic fields in high-mass clouds in a state prior to the onset of high–mass star formation have previously been available, and prevailing HMSF theories did not consider strong magnetic fields. Our dust continuum polarization observations show that high-mass filaments are strongly magnetized and detail the importance of magnetic fields relative to turbulence and gravity for HMSF. I will present the results of our POLSTAR survey on the magnetic field topology in clouds that are at different stages of evolution.
I will conclude with my thoughts on how these observations start to put very strong constraints on models of high-mass star formation and reveal the initial conditions for high-mass star formation.