The Massive and Distant Clusters of WISE Survey. VII. The Environments and Properties of Radio Galaxies in Clusters at z ∼ 1
The Massive and Distant Clusters of WISE Survey. VII. The Environments and Properties of Radio Galaxies in Clusters at z ∼ 1
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DOI：
10.3847/1538-4357/ab5af0
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发表时间：
2019-11
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影响因子：
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通讯作者：
E. Moravec;Anthony H. Gonzalez;D. Stern;T. Clarke;M. Brodwin;B. Decker;P. Eisenhardt;W. Mo;A. Pope;S. Stanford;D. Wylezalek
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作者：
E. Moravec;Anthony H. Gonzalez;D. Stern;T. Clarke;M. Brodwin;B. Decker;P. Eisenhardt;W. Mo;A. Pope;S. Stanford;D. Wylezalek
我们给出了与美国国家科学基金会的卡尔·G·詹斯基甚大阵列(VLA)一起研究的结果，该研究确定了位于z∼1的50个大质量星系团中扩展射电源的射电形态及其所在星系的性质。我们发现大部分射电形态是Fanaroff-Riley IIs。通过分析射电源的红外对应物，我们发现∼40%的宿主星系是候选的最亮星系团，∼83%与星系团中质量最大的前六个星系之一一致。我们通过检测环境和射电星系属性之间的相关性来研究环境因素对射电活动星系核种群的作用。我们发现最高质量的恒星主体(M*≳4×1011M⊙)局限在星团中心和宿主致密喷流中。有证据表明，随着半径的增大，喷流的尺寸增大，这可能归因于ICM压力约束随半径的增大而减小。除了这种相关性，射电活动星系核的属性(光度、形态或大小)与环境属性(集群丰富度和集群内的位置)之间没有其他显著的相关性。星系团环境中的活动星系核比这个时期的场多，再加上星系和环境性质之间缺乏很强的相关性，这一事实证明，星系团环境促进了射电活动，但并不是唯一驱动这些源在这个红移时的演化。
We present the results from a study with NSF’s Karl G. Jansky Very Large Array (VLA) to determine the radio morphologies of extended radio sources and the properties of their host galaxies in 50 massive galaxy clusters at z ∼ 1. We find a majority of the radio morphologies to be Fanaroff–Riley type IIs. By analyzing the infrared counterparts of the radio sources, we find that ∼40% of the host galaxies are the candidate brightest cluster galaxy and ∼83% are consistent with being one of the top six most massive galaxies in the cluster. We investigate the role of environmental factors on the radio-loud AGN population by examining correlations between environmental and radio-galaxy properties. We find that the highest stellar mass hosts (M* ≳ 4 × 1011 M⊙) are confined to the cluster center and host compact jets. There is evidence for an increase in the size of the jets with cluster-centric radius, which may be attributed to the decreased ICM pressure confinement with increasing radius. Besides this correlation, there are no other significant correlations between the properties of the radio-AGN (luminosity, morphology, or size) and environmental properties (cluster richness and location within the cluster). The fact that there are more AGN in the cluster environment than the field at this epoch, combined with the lack of strong correlation between galaxy and environmental properties, argues that the cluster environment fosters radio activity but does not solely drive the evolution of these sources at this redshift.