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SUMMARY:Why do galaxies cease forming stars? Evidence for AGN feedback dri
 ven quenching from cosmic dawn to the present epoch - Asa Bluck (Florida I
 nternational University)
DTSTART:20240719T103000Z
DTEND:20240719T113000Z
UID:TALK217753@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:In the local Universe there is distinct bimodality observed in
  galaxy properties\, such that most local systems are either actively star
  forming or non-star forming (‘quenched’). Quenched galaxies are now o
 bserved up to the first Gyr in the Universe’s history in unprecedented J
 WST observations. In this talk we identify the key testable predictions fr
 om AGN feedback driven quenching from contemporary cosmological models (e.
 g.\, EAGLE & IllustrisTNG). We then test these predictions across cosmic t
 ime with the SDSS & MaNGA (at z ~ 0)\, HST-CANDELS (at z ~ 0.5 – 2)\, an
 d JWST-CEERS (at z ~ 2 – 8). Simulations predict that AGN feedback drive
 n quenching will ultimately depend on the supermassive black hole (SMBH) m
 ass\, which directly traces the total integrated energy released from accr
 etion over cosmic time. Crucially\, little dependence on accretion rate or
  AGN luminosity is predicted by contemporary models. This has profound imp
 lications for the empirical study of quenching at all epochs. In lieu of d
 ynamical measurements of SMBH masses for large statistical samples\, the m
 odels predict that the galaxy central velocity dispersion or stellar poten
 tial should appear as the key driver of quiescence in machine learning cla
 ssification analyses\, which carefully remove spurious inter-correlations 
 between galaxy properties. This prediction is met precisely across 13 Gyrs
  of cosmic history (from z = 0 – 8). Hence\, we conclude that AGN feedba
 ck has likely been quenching star formation in massive galaxies since the 
 first Gyr of the Universe’s history. 
LOCATION:Ryle seminar room + online
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