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Radio loudness and classification for radio sources

机译：无线电源的无线电响度和分类

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摘要

The extragalactic radio sources are divided into two subclasses (radio-loud and radio-quiet sources) in the literature using radio loudness (R), which is defined as the ratio of radio emission to optical emission, but the boundary R-value separating the two classes is different in various sources. In this work, a sample of 2419 objects from the 13th catalog of quasars and active nuclei is used to build a boundary for the two subclasses. To do so, we compiled the radio and optical data, calculated their radio and optical indexes, made K-correction, obtained the radio loudness, and adopted a Bayesian analysis method to the logarithm of radio loudness for classification. We also investigated the correlations of radio loudness with radio/optical luminosities. Our main conclusions are summarized as follows: (1) The distribution of the logarithm of radio loudness (log R) is bimodal, the sources with log R < 1.26 are classified as radio-quiet sources, and those with log R > 1.26 are classified as radio-loud ones from the Bayesian analysismethod. (2) The average radio-optical effective spectral index of radio-quiet sources is = 0.05, while that of radio-loud sources is = 0.55. (3) There are positive correlations between radio luminosity and radio loudness for both radio-loud sources and radio-quiet sources. (4) A dividing line of separating the distribution of the clusters on the diagram of radio loudness against radio luminosity was obtained statistically to set the boundary between radio-loud sources and radio-quiet sources, with an accuracy of 99.73% based on the classification result from the Bayesian analysis method.
机译：文献中使用无线电响度（R）将河外射电源分为两个亚类（无线电响度和无线电安静源），无线电响度（R）定义为无线电发射与光学发射的比率，但分开这两类的边界R值在不同的源中是不同的。在这项工作中，来自第13个类星体和活动核目录的2419个物体样本被用来为这两个子类建立边界。为此，我们整理了射电和光学数据，计算了它们的射电和光学指数，进行了K-校正，得到了无线电响度，并采用贝叶斯分析方法对无线电响度的对数进行分类。我们还研究了无线电响度与无线电/光学光度的相关性。我们的主要结论如下：（1）无线电响度对数（logr）的分布是双峰的，logr<1.26的源被归类为无线电安静源，logr>1.26的源被归类为无线电响度源。（2） 无线电安静源的平均射电光学有效光谱指数<α（RO）>=0.05，而无线电大声源的平均射电光学有效光谱指数<α（RO）>=0.55。（3） 对于无线电大声源和无线电安静源，无线电亮度和无线电响度之间都存在正相关。（4） 根据贝叶斯分析方法的分类结果，统计得出了一条将无线电响度图上的簇分布与无线电亮度分开的分界线，以确定无线电响度源和无线电安静源之间的边界，准确率为99.73%。

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