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SUMMARY:Galaxies in JWST’s mirror may be more massive than they appear: 
 bottom-heavy initial mass functions at z ~ 0.7 from JWST-IMFERNO
DTSTART;VALUE=DATE-TIME:20261028T170500Z
DTEND;VALUE=DATE-TIME:20261028T171500Z
DTSTAMP;VALUE=DATE-TIME:20261023T003022Z
UID:indico-contribution-3645@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Chloe Cheng (University of Toronto)\nJWST's discover
 y of extremely massive\, quiescent galaxies in the early Universe has intr
 oduced significant tension with current galaxy formation models\, imply
 ing that galaxies formed and quenched faster and earlier than expected. 
  However\, estimates of distant galaxy masses are highly uncertain.  The
 y assume a stellar initial mass function (IMF) similar to that in the Mil
 ky Way\, despite evidence that the cores of massive\, local ellipticals (
 the likely descendants of these massive\, high-redshift galaxies) are ric
 her in low-mass stars (i.e. they have a bottom-heavy IMF).  Until now\, 
 it has been impossible to robustly measure the IMF beyond the low-redshift
  Universe in individual galaxies\, as extremely deep spectra covering both
  optical and near-infrared wavelengths are required.  The JWST-IMFERNO p
 rogram\, which combines deep\, optical spectra from the LEGA-C survey wit
 h extremely deep\, near-infrared\, JWST/NIRSpec-MSA spectra\, has unlocked
  this challenging constraint.  I will present the first robust measureme
 nts of the IMF beyond the local Universe.  Using a sample of 9 massive\,
  quiescent galaxies at z ~ 0.7\, I will demonstrate that distant galaxie
 s have bottom-heavy IMFs compared to the Milky Way\, implying higher stel
 lar masses than previously estimated.  Finally\, I will discuss how our 
 galaxies\, which are direct descendants of JWST’s “impossibly early”
  galaxies\, amplify tensions with galaxy formation models.\n\nhttps://nyx
 .physics.mcgill.ca/event/587/contributions/3645/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3645/
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