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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：河外射电源被分为两个亚类（无线电大声和无线电安静源）在文献中使用无线电响度（R），其被定义为无线电发射到光发射的比例，但在边界R值分离各种来源的两类不同。在这项工作中，使用来自Quasars和Active Nuclei的第13个目录的2419个对象的样本来为两个子类构建边界。为此，我们编译了无线电和光学数据，计算了他们的无线电和光学索引，使k校正，获得了无线电响度，并采用了贝叶斯分析方法对分类的无线电响应的对数。我们还研究了与无线电/光学光亮的无线电响度的相关性。我们的主要结论如下：（1）：（1）无线电响度（log r）对数的分布是双峰的，带有log r <1.26的来源被归类为无线电安静源，并且具有log r> 1.26的源分类作为贝叶斯analysismethod的无线电响亮。 （2）的无线电静音源的平均无线电光学有效谱指数是<α（RO）> = 0.05，而无线电大声源是<α（RO）> = 0.55。 （3）无线电源和无线电舒源的无线电波光度和无线电响度之间存在正相关。 （4）一种基于该分类划分针对无线电光度无线电响度的图上分离的簇的分布的线得到统计学设置无线电响亮源和无线电安静源之间的边界，具有99.73％的准确度贝叶斯分析方法产生的结果。

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  • 作者

    Zhang Lixia; Fan Junhui; Zhu Jingtian;

  • 作者单位

    Guangzhou Univ Ctr Astrophys Guangzhou 510006 Peoples R China|Dept Educ Guangdong Prov Astron Sci & Technol Res Lab Guangzhou 510006 Peoples R China|Key Lab Astron Observat & Technol Guangzhou Guangzhou 510006 Peoples R China;

    Guangzhou Univ Ctr Astrophys Guangzhou 510006 Peoples R China|Dept Educ Guangdong Prov Astron Sci & Technol Res Lab Guangzhou 510006 Peoples R China|Key Lab Astron Observat & Technol Guangzhou Guangzhou 510006 Peoples R China;

    Guangzhou Univ Ctr Astrophys Guangzhou 510006 Peoples R China|Dept Educ Guangdong Prov Astron Sci & Technol Res Lab Guangzhou 510006 Peoples R China|Key Lab Astron Observat & Technol Guangzhou Guangzhou 510006 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    galaxies: active; galaxies: jets; quasars: general;

    机译：星系：活跃;星系：喷气机;Quasars：一般;

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