PREPRINT

# The miniJPAS survey: The role of group environment in quenching the star formation

R. M. González Delgado, J. E. Rodríguez-Martín, L. A. Díaz-García, A. de Amorim, R. García-Benito, G. Martínez-Solaeche, P. A. A. Lopes, M. Maturi, E. Pérez, R. Cid Fernandes, A. Cortesi, A. Finoguenov, E. R. Carrasco, A. Hernán-Caballero, L. R. Abramo, J. Alcaniz, N. Benítez, S. Bonoli, A. J. Cenarro, D. Cristóbal-Hornillos, J. M. Diego, R. A. Dupke, A. Ederoclite, J. A. Fernández-Ontiveros, C. López-Sanjuan, A. Marín-Franch, I. Márquez, C. Mendes de Oliveira, M. Moles, I. Pintos, L. Sodré Jr., K. Taylor, J. Varela, H. Vázquez Ramió, J. M. Vílchez
arXiv:2207.05770

Submitted on 12 July 2022

## Abstract

The miniJPAS survey has observed $\sim 1$ deg${}^{2}$ on the AEGIS field with 60 bands (spectral resolution of $R\sim 60$) in order to demonstrate the capabilities of the Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) that will map $\sim 8000$ deg${}^{2}$ of the northern sky in the next years. This paper shows the power of J-PAS to detect low mass groups and characterise their galaxy populations up to $z\sim 1$. We use the spectral energy distribution fitting code BaySeAGal to derive the stellar population properties of the galaxy members in 80 groups at $z\le 0.8$ previously detected by the AMICO code, as well as for a galaxy field sample retrieved from the whole miniJPAS sample. We identify blue, red, quiescent, and transition galaxy populations through their rest-frame (extinction corrected) colour, stellar mass (${M}_{\star }$) and specific star formation rate. We measure their abundance as a function of ${M}_{\star }$ and environment. We find: (i) The fraction of red and quiescent galaxies in groups increases with ${M}_{\star }$ and it is always higher in groups than in the field. (ii) The quenched fraction excess (QFE) in groups strongly increases with ${M}_{\star }$, (from a few percent to higher than 60% in the mass range ${10}^{10}-3×{10}^{11}$ ${M}_{\odot }$. (iii) The abundance excess of transition galaxies in groups shows a modest dependence with ${M}_{\star }$ (iv) The fading time scale is very short ($<1.5$ Gyr), indicating that the star formation declines very rapidly in groups. (v) The evolution of the galaxy quenching rate in groups shows a modest but significant evolution since $z\sim 0.8$, compatible with an evolution with constant $QFE=0.4$, previously measured for satellites in the nearby Universe, and consistent with a scenario where the low-mass star-forming galaxies in clusters at  are environmentally quenched.

## Preprint

Comment: 21 pages, 20 figures, accepted for publication in Astronomy & Astrophysics

Subject: Astrophysics - Astrophysics of Galaxies