The Massive and Distant Clusters of WISE Survey. VIII. Radio Activity in Massive Galaxy Clusters
The Massive and Distant Clusters of WISE Survey. VIII. Radio Activity in Massive Galaxy Clusters
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DOI：
10.3847/1538-4357/abb08d
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发表时间：
2020-08
期刊：
影响因子：
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通讯作者：
W. Mo;Anthony H. Gonzalez;M. Brodwin;B. Decker;P. Eisenhardt;E. Moravec;S. Stanford;D. Stern;D. Wylezalek
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文献类型：
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作者：
W. Mo;Anthony H. Gonzalez;M. Brodwin;B. Decker;P. Eisenhardt;E. Moravec;S. Stanford;D. Stern;D. Wylezalek
我们提出了一项关于高红移星系团的中心放射性活动的研究。使用来自广域红外巡天探索者巡天的大质量和遥远星团以及二十厘米1.4 GHz射电天空微弱图像的0.7 < z < 1.5星系团的大样本，我们测量了中央500 kpc内包含射电源的星团比例，我们将其称为星团放射性比例，以及中央500 kpc内表现出射电发射的星团星系的比例。我们发现初步（2.25σ）证据表明，星团的放射性分数随着星团的丰富度而增加，而放射发光的星团星系的比例（W Hz−1）与丰富度在统计显着水平上没有相关性。与 0 < z < 0.6 处计算的结果相比，0 < z < 1.5 处的星团放射性分数增加了 10 倍。该分数还取决于射电光度。与红移较低的星团相比，红移较高的星团更有可能拥有光度为 W Hz−1 的射电源。我们将辐射发光星团星系的比例与在现场环境中测量的比例进行比较。对于 0.7 < z < 1.5，我们发现无论环境如何，星团和场辐射发光星系分数都会随着恒星质量的增加而增加，尽管在固定恒星质量下，星团星系辐射发光的可能性大约是场星系的 2 倍。
We present a study of the central radio activity of galaxy clusters at high redshift. Using a large sample of galaxy clusters at 0.7 < z < 1.5 from the Massive and Distant Clusters of Wide-field Infrared Survey Explorer Survey and the Faint Images of the Radio Sky at Twenty-Centimeters 1.4 GHz catalog, we measure the fraction of clusters containing a radio source within the central 500 kpc, which we term the cluster radio-active fraction, and the fraction of cluster galaxies within the central 500 kpc exhibiting radio emission. We find tentative (2.25σ) evidence that the cluster radio-active fraction increases with cluster richness, while the fraction of cluster galaxies that are radioluminous ( W Hz−1) does not correlate with richness at a statistically significant level. Compared to that calculated at 0 < z < 0.6, the cluster radio-active fraction at 0 < z < 1.5 increases by a factor of 10. This fraction is also dependent on the radio luminosity. Clusters at higher redshift are much more likely to host a radio source of luminosity W Hz−1 than are lower-redshift clusters. We compare the fraction of radioluminous cluster galaxies to the fraction measured in a field environment. For 0.7 < z < 1.5, we find that both the cluster and field radioluminous galaxy fraction increases with stellar mass, regardless of environment, though at fixed stellar mass, cluster galaxies are roughly 2 times more likely to be radioluminous than field galaxies.