A z=1.74 cluster has 18% red galaxies and a merging proto-BCG of 5.7e11 solar masses, implying Euclid will find ~400 assembling BCGs.
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astro-ph.GA 2representative citing papers
Observational analysis of COSMOS galaxy groups shows quiescent fraction builds steadily from z~1.5-2 with faster growth in richer groups, first RS ridgeline galaxies by z~2, a possible early overdensity at z=3.4, and no significant evolution in RS slope or scatter.
citing papers explorer
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Euclid: A blue galaxy population and a brightest cluster galaxy in the making in a $z\sim1.74$ MaDCoWS2 galaxy cluster candidate
A z=1.74 cluster has 18% red galaxies and a merging proto-BCG of 5.7e11 solar masses, implying Euclid will find ~400 assembling BCGs.
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COSMOS-Web galaxy groups: Evolution of red sequence and quiescent galaxy fraction
Observational analysis of COSMOS galaxy groups shows quiescent fraction builds steadily from z~1.5-2 with faster growth in richer groups, first RS ridgeline galaxies by z~2, a possible early overdensity at z=3.4, and no significant evolution in RS slope or scatter.