本征宇宙射电星系大尺度环境的破译II。环境属性的统计分析
Deciphering the Large-Scale Environment of Radio Galaxies in the Local Universe II. A Statistical Analysis of Environmental Properties
摘要：
在我们之前的分析中，我们研究了本地宇宙中两个射电星系（RGs）样本的大尺度环境（即红移z<0.15），根据它们的射电形态分类为FR I和FR II。分析是使用i）极其均匀的星表和ii）一种新的方法，称为宇宙学过密度，来研究它们的大尺度环境。我们的结论是，独立于其射电扩展结构的形状，RG居住在银河系丰富的大尺度环境中，具有相似的特征和丰富度。在目前的工作中，我们首先强调了我们的程序的其他优点，不受宇宙学偏见和/或文物，然后我们进行了额外的统计测试，以加强我们以前的结果。我们还调查使用的宇宙学邻居的RG环境的属性。我们发现，FRI和FRII的大规模环境是非常相似的，独立于中央RG的属性。最后，我们强调了在相同的红移箱比较射电源，以获得其大尺度环境的完整概述的重要性。
英文摘要：
In our previous analysis we investigated the large-scale environment of two samples of radio galaxies (RGs) in the local Universe (i.e. with redshifts z<0.15), classified as FR I and FR II on the basis of their radio morphology. The analysis was carried out using i) extremely homogeneous catalogs and ii) a new method, known as cosmological overdensity, to investigate their large-scale environments. We concluded that, independently by the shape of their radio extended structure, RGs inhabit galaxy-rich large-scale environments with similar characteristics and richness. In the present work, we first highlight additional advantages of our procedure, that does not suffer cosmological biases and/or artifacts, and then we carry out an additional statistical test to strengthen our previous results. We also investigate properties of RG environments using those of the cosmological neighbors. We find that large-scale environments of both FRIs and FRIIs are remarkably similar and independent on the properties of central RG. Finally, we highlight the importance of comparing radio sources in the same redshift bins to obtain a complete overview of their large-scale environments.
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