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SUMMARY:Of Dragons and Thunder: Characterising z&gt\;7 galaxies with the J
 WST/NIRSpec IFU - Gareth Jones (University of Cambridge)
DTSTART:20251126T134500Z
DTEND:20251126T141500Z
UID:TALK241294@talks.cam.ac.uk
CONTACT:Cristiano Longarini
DESCRIPTION:Recent years have seen a rapid expansion of new results from J
 WST\, which have revolutionised our understanding of galaxy evolution in t
 he first few billion years of the Universe. While many of these major resu
 lts originated from large scale surveys\, a few detailed case studies of i
 ndividual galaxies (or compact groups) have been performed using the NIRSp
 ec IFU. Here\, I will detail two such studies of very different objects: t
 he z= 7.152 galaxy system B14-65666 (also known as Big Three Dragons) as o
 bserved in the GA-NIFS survey and one of the most distant little red dots 
 (LRDs) known (UNCOVER_20466\; z=8.5) as observed in the BlackTHUNDER surve
 y. Line and continuum emission in Big Three Dragons is resolved into two s
 trong cores surrounded by diffuse emission\, as seen in recent JWST/NIRCam
  imaging. Our data constrain the gas-phase metallicity (~20-30% solar) and
  SFR for each region. This source lies on the mass-metallicity relation at
  z>4\, suggesting an evolved nature. The two core galaxies show contrastin
 g properties\, suggesting distinct evolutionary pathways. We confirm that 
 UNCOVER_20466 is an LRD containing an overmassive black hole\, and find th
 at its extremely high [OIII]4363/HGamma ratio is indicative of not only AG
 N photoionization and heating\, but also extremely high densities (ne~10^7
 cm^-3).
LOCATION:Hoyle Lecture theatre + Zoom 
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