A Transient Overcooling in the Early Universe? Clues from Globular Clusters Formation

by Alvio Renzini (INAF/OAPD)

Thursday 29 Jun 2023, 11:30 → 12:30 Europe/Rome

Sala Jappelli (Osservatorio Astronomico di Padova)

The mere existence of multiple stellar generations in Milky Way globular clusters indicates that each generation was unable to stop star formation, which instead persisted unimpeded for several million years. This evidence argues for an extended stage of star formation within a forming globular cluster, during which stellar feedback was substantially ineffective and the nascent globular cluster was actually able to accrete processed gas from its surrounding, and efficiently convert it into successive stellar generations. It has been argued that such delayed feedback results from core collapse in most massive stars failing to trigger an energetic supernova explosion, but rather leading directly to black hole formation. Thus, globular clusters offer a concrete phenomenological example for the lack of feedback in young starbursts that has been widely advocated to account for the unexpected abundance of UV-luminous galaxies at z = 9 − 16, as revealed by JWST observations.  

 

Link alla videochiamata: https://meet.google.com/bjj-yhgf-aed
Oppure digita: ‪(IT) +39 02 3046 1649‬ PIN: ‪388 109 229‬#