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SUMMARY:The black hole mass-metallicity relation and insights into galaxy 
 quenching - William Baker
DTSTART:20240124T131500Z
DTEND:20240124T140500Z
UID:TALK211297@talks.cam.ac.uk
CONTACT:107642
DESCRIPTION:Understanding the quenching of star formation in galaxies rema
 ins a central question within extragalactic astrophysics. In this talk I w
 ill explore the intricate interplay between galaxy quenching\, black hole 
 mass\, and 'starvation'. Previous research has established a strong correl
 ation between quiescence and black hole mass\, while other studies have hi
 ghlighted the role of 'starvation'—the halting of gas inflows—as a dri
 ving force in quenching\, based on rapid gas depletion through star format
 ion and chemical enrichment. This investigation bridges the gap between th
 ese findings\, shedding light on the underlying mechanisms. Leveraging an 
 extensive dataset of galaxies\, this study uses random forest regression a
 nd partial correlation coefficients to uncover the fundamental relationshi
 ps governing stellar metallicity with respect to other galaxy characterist
 ics. I will show that for actively star-forming galaxies\, stellar metalli
 city exhibits a strong dependence on stellar mass. However\, intriguingly\
 , for passive galaxies\, a dramatically different narrative emerges\, wher
 e the primary driver of stellar metallicity is the black hole mass. \nThis
  means the integrated impact of black hole feedback emerges as the crucial
  determinant\, cutting off gas inflows and inducing a state of 'starvation
 '\, ultimately leading to the observed rapid rise in stellar metallicity. 
 This\, in turn\, paves the way for the transition of a galaxy from star-fo
 rming to quiescent. This finding not only deepens our understanding of gal
 axy evolution but also offers key insights into the intricate mechanisms s
 haping the fate of galaxies across cosmic epochs.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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