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SUMMARY:Galaxy Evolution Across Cosmic Time: From Cosmic Noon to the Epoch
  of Reionization [Astrophysics Seminar]
DTSTART:20260430T060000Z
DTEND:20260430T070000Z
DTSTAMP:20260512T235300Z
UID:indico-event-432@events.iiap.res.in
CONTACT:colloqm@iiap.res.in
DESCRIPTION:Speakers: Ronaldo Laishram (National Astronomical Observatory 
 of Japan (NAOJ)\, Tokyo)\n\nAbstract: Galaxies grow\, transform\, and even
 tually quench across billions of years of cosmic history\, but how interna
 l structure\, star formation\, and large-scale environment are connected a
 cross different cosmic epochs remains an open question. In this talk\, I p
 resent a coherent observational picture of galaxy structural evolution fro
 m z ∼ 0.4 to the epoch of reionization\, combining Subaru HSC narrowband
  imaging\, JWST NIRCam\, and HST. At z ∼ 0.4\, environmental analysis of
  Hα emitters around galaxy clusters provides direct evidence that environ
 mental quenching was already operating efficiently at this epoch. At z ∼
  1–1.6\, morphological analysis of emission-line galaxies in the COSMOS 
 field investigates how galaxy structure and compactness vary across large-
 scale environments. At z ∼ 2.16\, pixel-by-pixel SED fitting of Spiderwe
 b protocluster members reveals clear inside-out quenching in massive quies
 cent galaxies. At higher redshifts\, structural analysis of Lyman-α emitt
 ers across z ∼ 2–7 from JWST COSMOS-Web reveals systematic size evolut
 ion and a significant anticorrelation between compactness and Lyα equival
 ent width. Within this sample\, we report the discovery of a protocluster 
 at z ≈ 4.9 with clear wavelength-dependent environmental effects on gala
 xy morphology. I present spatially resolved Hα morphological analysis of 
 galaxies at z ∼ 4–6 with JWST\, tracing how star formation structure e
 volves near the epoch of reionization. \n\nhttps://events.iiap.res.in/eve
 nt/432/
LOCATION:Auditorium
URL:https://events.iiap.res.in/event/432/
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