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SUMMARY:Putting brakes on star formation in central galaxies - Joanna Piot
 rowska (University of Cambridge)
DTSTART:20221026T124000Z
DTEND:20221026T130500Z
UID:TALK189092@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Understanding the physical processes responsible for ceasing s
 tar formation in galaxies is one of the most important unresolved question
 s in the field of galaxy evolution. The past two decades of both observati
 ons and simulations showed that there potentially exist many a reason for 
 which galaxies can experience a slowdown in their star formation activity\
 , i.e.\, ‘quench’ their star formation. In the complex landscape of co
 rrelated data\, varying timescales\, and limited observables\, identifying
  key physical drivers of quenching becomes a non-trivial problem.\nIn this
  talk I will investigate how star formation is brought to a halt in local\
 , massive\, central galaxies by comparing Sloan Digital Sky Survey (SDSS) 
 observations with three state-of-the-art hydrodynamical cosmological simul
 ations - EAGLE\, Illustris and IllustrisTNG. In this work we address the c
 omplex nature of quenching by combining machine learning techniques with p
 artial correlation analysis to determine which galactic property is the mo
 st predictive of galaxy quiescence. We find that the supermassive black ho
 le mass (MBH) is the most powerful parameter in determining whether a gala
 xy is star-forming or quenched - a statement which is true for all three i
 mplementations of AGN feedback in the simulations. Remarkably\, this predi
 ction is precisely confirmed in the SDSS observations\, where we infer MBH
  from a variety of calibrations for ~230 000 local galaxies.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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