Résumé / Abstract Seminaire_IAP
« An epoch-dependent transition from high turnover to dominated star formation rate suppression in galaxy groups. »

Rafael Arango-Toro
Institut d'Astrophysique de Paris (Paris, France)

Galaxy groups are a key environment for understanding how star formation is regulated and eventually quenched, since they host a large fraction of galaxies and sit between the field and the most massive clusters. At the same time, addressing these questions requires deep and homogeneous datasets, which are now available in the COSMOS2025/COSMOS-Web context.

In this seminar, I will present ongoing work on galaxy groups, focusing on how recent quenching depends on group richness, group-centric radius, and redshift. The current picture suggests stronger quenching in richer systems and in inner group regions, while at earlier epochs the signal appears more mixed, and at later times it becomes more clearly dominated by SFR suppression.

To place this study in context, I will briefly revisit earlier work using non-parametric star formation histories to reconstruct population-level evolutionary channels in the stellar mass–SFR plane. I will also discuss how this connects to the physical-parameter framework developed for COSMOS2025 DR1 from multi-wavelength photometry, with non-parametric SFHs acting as a common link between catalog-level inference and the science analysis itself.
jeudi 16 avril 2026 - 11:00
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
Page web du séminaire / Seminar's webpage