TY - JOUR
T1 - The Three Hundred Project
T2 - The Influence of Environment on Simulated Galaxy Properties
AU - Wang, Yang
AU - Pearce, Frazer
AU - Knebe, Alexander
AU - Yepes, Gustavo
AU - Cui, Weiguang
AU - Power, Chris
AU - Arth, Alexander
AU - Gottlöber, Stefan
AU - Petris, Marco De
AU - Brown, Shaun
AU - Feng, Longlong
PY - 2018/12/1
Y1 - 2018/12/1
N2 - 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.
AB - 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.
KW - galaxies: clusters: general
KW - galaxies: evolution
KW - methods: numerical
UR - http://www.scopus.com/inward/record.url?scp=85057629691&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/aae52e
DO - 10.3847/1538-4357/aae52e
M3 - Article
AN - SCOPUS:85057629691
SN - 0004-637X
VL - 868
JO - The Astrophysical Journal
JF - The Astrophysical Journal
IS - 2
M1 - 130
ER -