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SUMMARY:Bulge-driven quenching in KILOGAS: separating classical bulges\, p
 seudobulges and disks with SPADE
DTSTART;VALUE=DATE-TIME:20261028T182100Z
DTEND;VALUE=DATE-TIME:20261028T182200Z
DTSTAMP;VALUE=DATE-TIME:20261026T031916Z
UID:indico-contribution-3698@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Angelo George (ASIAA)\nBulges are implicated in quen
 ching\, but which bulges\, and how they quench galaxies (gas-driven or eff
 iciency-driven)\, remain open questions. We present SPADE (Spectro-Photome
 tric Analytic Decomposition Engine)\, a new method that fits imaging\, int
 egral-field stellar kinematics and stellar-population spectra of a galaxy 
 simultaneously under one likelihood to separate a bulge from a disk\, and 
 uses the joint evidence to distinguish classical bulges from pseudobulges.
  We apply SPADE to 450 galaxies from KILOGAS\, an ALMA CO(2-1) survey at k
 iloparsec resolution of MaNGA and SAMI galaxies\, assigning every star-for
 ming\, green-valley and quiescent galaxy a bulge type and every spaxel a b
 ulge or disk membership. Combining this with the resolved star-forming mai
 n sequence\, molecular gas main sequence and Kennicutt-Schmidt relation\, 
 we measure how far classical bulge\, pseudobulge and disk regions deviate 
 from these resolved scaling relations as a function of radius. We then dec
 ompose the specific star-formation-rate deficit into a gas-fraction term a
 nd a star-formation-efficiency term. Classical bulges in green-valley gala
 xies fall well below their own disks in star formation\, and most of that 
 deficit is a loss of efficiency rather than of gas\, driven by a growing f
 raction of regions that have stopped forming stars. Pseudobulges show no s
 uch suppression\, and the gas deficit that does exist is concentrated in r
 egions where CO is undetected. These results favour quenching that begins 
 inside classical bulges as a failure to convert gas into stars\, with gas 
 loss following rather than leading.\n\nhttps://nyx.physics.mcgill.ca/event
 /587/contributions/3698/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3698/
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