标题： 星系团中的射电源：径向分布以及1.4 GHz和K波段双变量亮度函数 显示英文标题

标题： Radio Sources in Galaxy Clusters: Radial Distribution, and 1.4 GHz and K-band Bivariate Luminosity Function

摘要： 我们对附近星系团中若干基本性质的统计研究进行了展示，包括星系团内的径向分布、射电亮度函数（RLF）以及成为射电源的星系比例（射电活跃比例，RAF）。这项分析针对的是一个由573个在X射线波段被探测到并且在NVSS中于1.4 GHz观测到的星系团样本。来自2MASS的K波段数据被用来识别最亮的星系团星系（BCG），并构建K波段的LF。我们的主要结果包括：（1）射电明亮的活动星系核（AGN）的表面密度分布比所有星系更加集中，并可以用约25的浓度参数描述的NFW分布来表示。（2）星系团与场中的RLF比较显示，星系团AGN的数量密度大约高出5700倍，对应于星系在星系团中成为射电源的概率比在场中高出6.8倍。我们认为，星系团中约40%-50%的射电明亮AGN可能存在于低质量星系（M_K>-23）中。（3）估计了不同恒星质量的星系团星系的RAF。比特征亮度更亮的星系（M_K<M_*~-24）中约有5%的星系拥有射电明亮的AGN。BCG的RAF>30%，且依赖于星系团的质量。与场中的星系相比，星系团星系的RAF高出5-10倍。结合AGN的RLF和在星系团内的空间分布，我们估计它们可能会在星系团中心附近的星团际介质中注入约0.13 keV/粒子的能量。我们还研究了星系团射电源对SZE星系团巡天结果的污染程度，并估计高达10%的在150 GHz处被探测到的星系团可能包含其流量与星团SZE信号相当的AGN。（摘要） 显示英文摘要

摘要： We present a statistical study of several fundamental properties of radio sources in nearby clusters, including the radial distribution within clusters, the radio luminosity function (RLF), and the fraction of galaxies that is radio-active (radio active fraction, RAF). The analysis is carried out for a sample of 573 clusters detected in the X-ray and also observed at 1.4 GHz in the NVSS. K-band data from the 2MASS are used to identify the brightest cluster galaxies (BCGs), and to construct the K-band LF. Our main results include: (1) The surface density profile of radio-loud AGNs is much more concentrated than that of all galaxies, and can be described by the NFW profile with concentration ~ 25. (2) A comparison of the RLFs in the clusters and in the field shows that the cluster AGN number density is about 5,700 times higher, corresponding to a factor of 6.8 higher probability of a galaxy being radio active in the cluster than in the field. We suggest that about 40-50% of radio-loud AGNs in clusters may reside in low mass galaxies (M_K>-23). (3) The RAFs of cluster galaxies of different stellar mass are estimated. About 5% of galaxies more luminous than the characteristic luminosity (M_K<M_*~-24) host radio-loud AGNs. The RAF for BCGs is >30%, and depends on the cluster mass. Compare to the field population, cluster galaxies have 5-10 times higher RAF. Combining the AGN RLF and spatial distribution within clusters, we estimate that they may inject an energy of ~0.13 keV per particle to the intracluster medium near the cluster center. We also investigate the degree of contamination by cluster radio sources on the yields of SZE cluster surveys, and estimate that as many as 10% of clusters detected at 150 GHz may host AGNs whose flux is comparable to the cluster SZE signal. (abridged)