Radio AGNs in 13,240 Galaxy Clusters from the Sloan Digital Sky Survey
Radio AGNs in 13,240 Galaxy Clusters from the Sloan Digital Sky Survey
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DOI：
10.1086/522086
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发表时间：
2007-05
期刊：
影响因子：
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通讯作者：
S. Croft;W. D. de Vries;R. Becker
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文献类型：
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作者：
S. Croft;W. D. de Vries;R. Becker
我们将 maxBCG 目录中 13,240 个 0.1 ≤ z ≤ 0.3 的最亮星团星系 (BCG) 的位置与 FIRST 巡天的射电源相关联，以研究星系团中射电活动星系核的大小和分布。我们发现 19.7% 的 BCG 与 FIRST 源相关，这一比例取决于 BCG 的恒星质量，并在较小程度上取决于母星团的丰富度（即射电响度随质量增加而增加）。与 BCG 相关的无线电发射的固有大小峰值为 55 kpc，尾部延伸至 200 kpc。扩展源的无线电功率将它们置于 FR I 和 FR II 类型源之间，而无线电中紧凑的源往往射电发光程度较低。我们还检测到与集群相关的过量无线电源，而不是与 BCG 本身相关的无线电源，扩展到约 1.4 Mpc。
We correlate the positions of 13,240 brightest cluster galaxies (BCGs) with 0.1 ≤ z ≤ 0.3 from the maxBCG catalog with radio sources from the FIRST survey to study the sizes and distributions of radio AGNs in galaxy clusters. We find that 19.7% of our BCGs are associated with FIRST sources, and this fraction depends on the stellar mass of the BCG, and to a lesser extent on the richness of the parent cluster (in the sense of increasing radio-loudness with increasing mass). The intrinsic size of the radio emission associated with the BCGs peaks at 55 kpc, with a tail extending to 200 kpc. The radio power of the extended sources places them on the divide between FR I and FR II type sources, while sources compact in the radio tend to be somewhat less radio-luminous. We also detect an excess of radio sources associated with the cluster, instead of with the BCG itself, extending out to ~1.4 Mpc.