Satellite quenching was not important for z ∼ 1 clusters: most quenching occurred during infall

ABSTRACT We quantify the relative importance of environmental quenching versus pre-processing in z ∼ 1 clusters by analysing the infalling galaxy population in the outskirts of 15 galaxy clusters at 0.8 < z < 1.4 drawn from the GOGREEN and GCLASS surveys. We find significant differences betwee...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2022-02, Vol.510 (1), p.674-686
Main Authors: Werner, S V, Hatch, N A, Muzzin, A, van der Burg, R F J, Balogh, M L, Rudnick, G, Wilson, G
Format: Article
Language:English
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Summary:ABSTRACT We quantify the relative importance of environmental quenching versus pre-processing in z ∼ 1 clusters by analysing the infalling galaxy population in the outskirts of 15 galaxy clusters at 0.8 < z < 1.4 drawn from the GOGREEN and GCLASS surveys. We find significant differences between the infalling galaxies and a control sample; in particular, an excess of massive quiescent galaxies in the infalling region. These massive infalling galaxies likely reside in larger dark matter haloes than similar-mass control galaxies because they have twice as many satellite galaxies. Furthermore, these satellite galaxies are distributed in an NFW profile with a larger scale radius compared to the satellites of the control galaxies. Based on these findings, we conclude that it may not be appropriate to use ‘field’ galaxies as a substitute for infalling pre-cluster galaxies when calculating the efficiency and mass dependence of environmental quenching in high-redshift clusters. By comparing the quiescent fraction of infalling galaxies at 1 < R/R200
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stab3484