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

Werner, S. V.; Hatch, N. A.; Muzzin, A.; van der Burg, R F J; Balogh, M. L.; Rudnick, G.; Wilson, G.

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<3 to the cluster sample (R/R200<1) we find that almost all quiescent galaxies with masses >1011 Mpdbl were quenched prior to infall, while up to half of lower mass galaxies were environmentally quenched after passing the virial radius. This means most of the massive quiescent galaxies in z ∼1 clusters were self-quenched or pre-processed prior to infall.

Citation

Werner, S. V., Hatch, N. A., Muzzin, A., van der Burg, R. F. J., Balogh, M. L., Rudnick, G., & Wilson, G. (2022). Satellite quenching was not important for z ∼1 clusters: Most quenching occurred during infall. Monthly Notices of the Royal Astronomical Society, 510(1), 674-686. https://doi.org/10.1093/mnras/stab3484

• Journal Article Type: Article
• Acceptance Date: Nov 26, 2021
• Online Publication Date: Dec 3, 2021
• Publication Date: Feb 1, 2022
• Deposit Date: Jan 26, 2022
• Publicly Available Date: Jan 26, 2022
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 510
• Issue: 1
• Pages: 674-686
• DOI: https://doi.org/10.1093/mnras/stab3484
• Keywords: Space and Planetary Science; Astronomy and Astrophysics
• Public URL: https://nottingham-repository.worktribe.com/output/7340583
• Publisher URL: https://academic.oup.com/mnras/article/510/1/674/6449002
• Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record S V Werner, N A Hatch, A Muzzin, R F J van der Burg, M L Balogh, G Rudnick, G Wilson, Satellite quenching was not important for z ∼ 1 clusters: most quenching occurred during infall, Monthly Notices of the Royal Astronomical Society, Volume 510, Issue 1, February 2022, Pages 674–686, is available online at:https://doi.org/10.1093/mnras/stab3484