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SUMMARY:Why do galaxies stop forming stars? - Asa Bluck
DTSTART:20190306T131500Z
DTEND:20190306T134500Z
UID:TALK117424@talks.cam.ac.uk
CONTACT:Catrina Diener
DESCRIPTION:I will present an overview of my ongoing research into galacti
 c star \nformation and its cessation in the ‘quenching’ process. From 
 an analysis \nof the SDSS\, we discover that the fraction of quenched cent
 ral galaxies \nscales most tightly with estimates of supermassive black ho
 le mass. This \nresult is consistent with models which quench centrals thr
 ough AGN \nfeedback\, particularly in the so called ‘radio-mode’. Howe
 ver\, satellite \ngalaxies require additional quenching mechanisms\, stron
 gly correlated \nwith environment. I will also present new work examining 
 resolved star \nformation and quenching in galaxies using the MaNGA survey
 . Through a \ndetailed machine learning analysis\, we conclude that global
  properties \n(particularly those most connected with the central regions 
 in galaxies) \nare the most predictive of quenching in both centrals and s
 atellites. \nPerhaps surprisingly\, the conditions at the spaxel location 
 are largely \nuncorrelated with quenching. Conversely\, we find that local
  parameters \nare most effective at predicting the rate of star formation 
 in star \nforming regions. From these results\, we conclude that quenching
  is a \nglobally governed process (affecting entire galaxies as a whole)\,
  but \nstar formation is a locally governed process (varying significantly
  \nthroughout galaxies\, depending on local conditions).
LOCATION:Sackler Lecture Theatre\, IoA
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