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SUMMARY:How Environment Shapes Quiescent Galaxy Stellar Halo Assembly: Ins
 ights from Extended Light and Color Profiles
DTSTART;VALUE=DATE-TIME:20261028T172500Z
DTEND;VALUE=DATE-TIME:20261028T173500Z
DTSTAMP;VALUE=DATE-TIME:20261024T125553Z
UID:indico-contribution-3646@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Devin Williams (Saint Mary's University)\nGalaxies d
 o not grow in isolation. Interactions with neighboring galaxies and materi
 al in their surrounding cosmic environments can drive stellar mass assembl
 y and morphological evolution. Galaxy stellar haloes retain signatures of 
 these externally driven processes due to the long dynamical timescales in 
 galaxy outskirts. Observations tracing stellar halo buildup therefore prov
 ide a probe of how merger-driven accretion and environmental processing sh
 ape galaxy assembly over cosmic time. In this talk\, I will present a comb
 ined investigation of stellar halo evolution in quiescent galaxies (QGs) a
 cross cluster and field environments over 0.1 ≤ z ≤ 1.0. Using deep CL
 AUDS+HSC-SSP multiband imaging\, we measure rest-frame g-band light and (U
 −g) color profiles extending to 10Rₑ for ∼90\,000 QGs with log(M★/
 M☉) ≥ 9.66. We isolate environmental effects by comparing the evolutio
 n in median light and color profiles of cluster QGs with those of stellar 
 mass- and redshift-matched field QGs\, tracing both the buildup of stellar
  halo material and the evolution of extended radial color gradients. Our r
 esults indicate that high-mass cluster QGs exhibit enhanced stellar halo g
 rowth fueled by increased accretion. This accretion likely arises from min
 or mergers occurring in cluster outskirts or pre-infall groups\, which dep
 osit bluer stellar populations (younger and/or lower metallicity stars) in
 to the outskirts of higher-mass cluster QGs. In contrast\, low-mass cluste
 r QGs show suppressed stellar halo growth and increased reddening of their
  outskirts relative to the field. These lower-mass QGs likely lose outer s
 tellar halo material through environmental stripping or accretion by high-
 mass galaxies during mergers.\n\nhttps://nyx.physics.mcgill.ca/event/587/c
 ontributions/3646/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3646/
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