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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-8441
DTSTART:20231012T203000Z
DTEND:20231012T213000Z
DTSTAMP:20260414T051819Z
LAST-MODIFIED:20230929T145222Z
LOCATION:4421 Sterling Hall
SUMMARY:Searching for the Impact of Active Galactic Nuclei in Galaxy Q
 uenching\, Astronomy Colloquium\, Prof. Decker French\, The University
  of Illinois at Urban-Champaign
DESCRIPTION:AGN feedback is expected to have a key role in the evoluti
 on of galaxies\, especially as galaxies evolve from star-forming to qu
 iescent. However\, direct connections between observations of AGN acti
 vity and the quenching of galaxies have been difficult. AGN vary on al
 l timescales\, with complete duty cycles more rapid than the timescale
 s to observe evolutionary trends in galaxies. Wide-field spectroscopic
  observations provide a key observational constraint on the past AGN h
 istories of galaxies through the detection of extended emission line r
 egions. The effects of past AGN activity can be observed if gas surrou
 nding the galaxy is illuminated by a nuclear source\, even if the AGN 
 has faded. Extreme examples of this can be observed as "voorwerps" in 
 broadband imaging\, but spectroscopy is needed to find and characteriz
 e fainter cases. I will present recent work using MaNGA observations o
 f galaxies in the process of quenching after a starburst (post-starbur
 st galaxies). Using MaNGA observations of multiple post-starburst gala
 xy samples\, we see extended emission line regions due to past AGN act
 ivity. These observations allow us to constrain the duty cycle of AGN 
 activity during this transitionary phase of galaxy evolution over a lo
 ng time baseline of 10^4 - 10^5 years. This intermittent AGN activity 
 may play a role in suppressing star formation\, driving low velocity o
 utflows\, and removing molecular gas in quenching galaxies.
URL:https://www.physics.wisc.edu/events/?id=8441
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