Oral Presentation
DeepDive: Proto-clusters of massive quiescent galaxies at z~4
Presenter: Takumi Kakimoto (The Graduate University for Advanced Studies)
We report on the discovery of two proto-clusters of massive quiescent galaxies (QGs) with the JWST/NIRspec. DeepDive, one of the JWST Cycle 2 programs, and archival data confirmed multiple QGs in the vicinity of the two QGs that had been identified by ground-based telescopes. According to the analysis of galaxy number density with photometric redshift, both galaxies are located in over-density regions where the number density of galaxies are about 2.5 times larger than the average. Interestingly, the SED fitting results suggest that most of the galaxies comprising each proto-cluster follow similar star formation histories. This trend is also suggested in proto-clusters of QGs which were already identified by ground-based telescopes (Ito+23, Tanaka+24), and it indicates that the large-scale environment of galaxies plays an important role in the formation of QGs. In this presentation, I will discuss how the star formation process took place based on comparisons with cosmological simulations.
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