# Effect of the environment on star formation activity and stellar mass for star-forming galaxies in the COSMOS field

S. M. Randriamampandry, M. Vaccari, K. M. Hess

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

## Abstract

We investigate the relationship between the environment and the galaxy main sequence (the relationship between stellar mass and star formation rate), as well as the relationship between the environment and radio luminosity ( $P_{\rm 1.4\, GHz}$ ), to shed new light on the effects of the environment on galaxies. We use the VLA-COSMOS 3-GHz catalogue, which consists of star-forming galaxies and quiescent galaxies (active galactic nuclei) in three different environments (field, filament, cluster) and for three different galaxy types (satellite, central, isolated). We perform for the first time a comparative analysis of the distribution of star-forming galaxies with respect to the main-sequence consensus region from the literature, taking into account galaxy environment and using radio observations at 0.1 ≤ z ≤ 1.2. Our results corroborate that the star formation rate is declining with cosmic time, which is consistent with the literature. We find that the slope of the main sequence for different z and M* bins is shallower than the main-sequence consensus, with a gradual evolution towards higher redshift bins, irrespective of environment. We see no trends for star formation rate in either environment or galaxy type, given the large errors. In addition, we note that the environment does not seem to be the cause of the flattening of the main sequence at high stellar masses for our sample.
Original language English 948-956 9 Monthly Notices of the Royal Astronomical Society 499 1 https://doi.org/10.1093/mnras/staa2669 Published - Nov-2020

## Keywords

• galaxies: evolution
• galaxies: star formation
• galaxies: stellar content
• Astrophysics - Astrophysics of Galaxies
• SUBMILLIMETER GALAXIES
• FORMATION HISTORY
• DENSITY RELATION
• FORMATION RATES
• MAIN-SEQUENCE
• EVOLUTION