The Three Hundred Project: The Influence of Environment on Simulated Galaxy Properties

Yang Wang, Frazer Pearce, Alexander Knebe, Gustavo Yepes, Weiguang Cui, Chris Power, Alexander Arth, Stefan Gottlöber, Marco De Petris, Shaun Brown, Longlong Feng

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

The relationship between galaxy properties and environment is a widely discussed topic within astrophysics. Here, we use galaxy samples from hydrodynamical resimulations to examine this relationship. We use the overdensity (δ 1) within a sphere around a galaxy to evaluate its environment. Then, the relations between galaxy properties, such as specific star formation rate (sSFR), fraction of star-forming galaxies, g-r color, and δ 1 are examined within three galactic samples formed from galaxies within large clusters, those in the vicinity of large clusters, and those in the field. We find tight environmental correlations for these galaxy properties. In brief, galaxies in denser environments tend to be redder and are more likely to be quenched; this is consistent with observations. We find that although the sSFR decreases with δ 1, this is mainly because galaxies with higher stellar mass reside in an environment with higher overdensity. At fixed overdensity, a galaxy's color is also independent of whether it lives within a cluster or within the field, but the relative fractions of the two samples varies dramatically with overdensity, and this drives an apparent evolution.

Original languageEnglish
Article number130
JournalThe Astrophysical Journal
Volume868
Issue number2
DOIs
Publication statusPublished - 1 Dec 2018

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