Speaker
Description
Recent observations with the JWST and ALMA identified at z > 10 massive star forming galaxies of up to 1011 solar masses that are already quench at z > 3. This very early formation and rapid evolution of massive galaxies produced great surprise, because it is difficult to reconcile with standard $\Lambda$CDM predictions alone. I will show that BH feedback regulate the formation and evolution of massive galaxies in the early Universe. Since the diameter of the Universe decreases with redshift z as 1/(1+z), the global gas density of the Universe increases with redshift, positive BH-feedback becoming a relevant mechanism in the early Universe. Observations with JWST and ALMA confirm this prediction, and in this context, the existence of massive star formation galaxies at z > 10 that are already quench at z > 3 is not surprising. If the SMBHs of more than 107 solar masses found in quasars up to z = 7 result from rapidly growing BH seeds, I conclude that BHs come first and their feedback regulate the early formation, growth and quench of massive galaxies in the early Universe.
