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SUMMARY:Early Massive Galaxies and Scaled-Up LRDs: Clues from Euclid and J
 WST - Karina Caputi (Groningen)
DTSTART:20251121T113000Z
DTEND:20251121T123000Z
UID:TALK235042@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:The formation of massive galaxies in the first billion years o
 f cosmic time is one of the most remarkable findings of Extragalactic Astr
 onomy and challenges the predictions of galaxy formation models. Finding t
 he right candidates is the first step towards understanding how such effic
 ient galaxy formation could have happened at early cosmic time. Another\, 
 a priori completely different\, high-z galaxy population whose formation i
 s also very puzzling are the so-called 'Little Red Dots (LRDs)'.  Discover
 ed almost by chance in JWST galaxy surveys\, most of these objects appear 
 to host overgrown super-massive black holes. An intriguing issue is how br
 ight and extreme these objects could be. In the first part of this talk\, 
 I will present the results of our search of massive galaxy candidates at t
 he end of the Epoch of Reionization using the first set of Euclid images o
 ver several tens of square degrees of the sky. I will also discuss the pre
 sence of massive galaxies in JWST surveys at similar redshifts and the coh
 erence of all results in a common context. In the second part of my talk\,
  I will present our results on the study of Euclid sources with double-pow
 er-law spectral energy distributions at z>4 in the COSMOS field\, where th
 e Euclid data has already a depth very similar to the final expected depth
  of the Euclid Deep Surveys. I will discuss the presence of scaled-up LRD 
 candidates\, identified based on their compactness\,  and their derived pr
 operties in comparison to those of classical JWST-selected LRDs. Finally\,
  I will conclude by discussing whether LRDs could also eventually give ris
 e to massive galaxy formation.\n\n
LOCATION:Ryle Seminar Room\, KICC + online
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