Star formation quenching in the infall region around galaxy clusters

JUAN MANUEL SALERNO, HERNÁN MURIEL, VALERIA COENDA, SOFÍA A. CORA, LUIS PEREYRA, ANDRÉS N. RUIZ, CRISTIAN A. VEGA-MARTÍNEZ

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2022

0035-8711

We analyse the connection between the star formation quenching of galaxies and their locationin the outskirts of clusters in the redshift range 푧 = [0, 2] by estimating the fraction of redgalaxies. More specifically, we focus on galaxies that infall isotropically from those that areinfalling alongside filaments. We use a sample of galaxies obtained from the semi-analyticmodel of galaxy formation sag applied to the MultiDark simulation. mdpl2. In agreementwith observational results, we find that the infall regions show levels of star formation that areintermediate between those of galaxies in clusters and in the field. Moreover, we show that, inthe redshift range [0-0.85], the quenching of the star formation is stronger in the filamentaryregion than in the isotropic infall region. We also study the fraction of red galaxies as afunction of the normalised distance to the cluster centre and find that, for radii 푅/푅200 > 3, thefraction of red galaxies in the filamentary region is considerably larger than in the isotropicinfall region. From the analysis of properties of the main progenitors of galaxies identified at푧 = 0, we find that they have different evolutionary behaviours depending on the stellar massand environment. Our results confirm the observational findings that suggest that the infallregions of clusters play an important role in the pre-processing of galaxies along most of theevolutionary history of galaxies