Satellite quenching was not important for z$\sim$1 clusters: most quenching occurred during infall
Satellite quenching was not important for z$\sim$1 clusters: most quenching occurred during infall
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卫星猝灭对于 z$sim$1 簇来说并不重要：大多数猝灭发生在坠落期间
DOI：
10.1093/mnras/stab3484
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
G. Wilson
中科院分区：
文献类型：
--
作者：
S. Werner;N. Hatch;A. Muzzin;R. Burg;M. Balogh;G. Rudnick;G. Wilson
通过分析GOGREEN和GCLASS巡天中15个0.8 < z < 1.4星系团外围的落星系群，我们定量分析了环境淬灭与预处理在z <1星系团中的相对重要性。我们发现显着的差异之间的下落星系和控制样本，特别是，大量的静止星系在下落区域。这些巨大的星系可能存在于比类似质量控制星系更大的暗物质晕中，因为它们有两倍多的卫星星系。此外，这些卫星星系分布在一个NFW的轮廓与更大的尺度半径相比，控制星系的卫星。基于这些研究结果，我们得出结论，它可能是不合适的使用“场”星系作为一个替代品，在计算高红移星系团的环境淬灭的效率和质量依赖性时，落入前星系团星系。通过比较1 < R/R200< 3的坍缩星系的静止分数与星团样本（R/R200< 1），我们发现几乎所有质量> 10 ~（11）M的静止星系在坍缩前都发生了猝灭，而多达一半的低质量星系在通过维里半径后发生了环境猝灭。这就意味着大多数z 1星系团中的大质量静止星系在坠落前都是自猝灭或预处理过的。
Wequantify 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 dependency 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 > 1011M were quenched prior to infall, whilst 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.