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The Three Hundred Project: the influence of environment on simulated galaxy properties

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


Yang Wang

Alexander Knebe

Gustavo Yepes

Weiguang Cui

Chris Power

Alexander Arth

Stefan Gottlöber

Marco De Petris

Shaun Brown

Longlong Feng


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 (δ1)within a h-1Mpc 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 δ1 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 δ1, 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.

Journal Article Type Article
Publication Date Dec 1, 2018
Journal Astrophysical Journal (Deleted)
Print ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 868
Issue 2
Article Number 130
APA6 Citation Wang, Y., Pearce, F., Knebe, A., Yepes, G., Cui, W., Power, C., …Feng, L. (2018). The Three Hundred Project: the influence of environment on simulated galaxy properties. Astrophysical Journal, 868(2), doi:10.3847/1538-4357/aae52e
Keywords Space and Planetary Science; Astronomy and Astrophysics
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