附近射电源的博洛尼亚完全样本：II --微弱核源的相位参考观测
The Bologna complete sample of nearby radio sources: II -- phase referenced observations of faint nuclear sources
摘要：
为了研究不同类别源的统计特性，有必要观察一个没有选择效应的样本。为了做到这一点，我们发起了一个项目，观察从B2射电源目录和第三剑桥修订目录（3CR）中选择的射电星系的完整样本，对核属性没有选择限制。我们将这个样本命名为“博洛尼亚完整样本”（BCS）。我们提出了新的VLBI观测在5和1.6 GHz的33个来源，从一个样本不偏向于方向。通过将这些数据与文献中的数据相结合，可获得关于秒差距尺度形态的信息，共94个射电源中的76个，其具有无线电功率和千秒差距尺度形态的范围。在毫角秒分辨率的双边源的分数是高的（30%），在厘米波长的VLBI调查中发现的分数相比，从统一模型的预测预期。秒差距尺度的喷流通常是直的，并与千秒差距尺度的喷流排成一行。一些特殊的来源进行了详细讨论。
英文摘要：
To study statistical properties of different classes of sources, it is necessary to observe a sample that is free of selection effects. To do this, we initiated a project to observe a complete sample of radio galaxies selected from the B2 Catalogue of Radio Sources and the Third Cambridge Revised Catalogue (3CR), with no selection constraint on the nuclear properties. We named this sample "the Bologna Complete Sample" (BCS). We present new VLBI observations at 5 and 1.6 GHz for 33 sources drawn from a sample not biased toward orientation. By combining these data with those in the literature, information on the parsec-scale morphology is available for a total of 76 of 94 radio sources with a range in radio power and kiloparsec-scale morphologies. The fraction of two-sided sources at milliarcsecond resolution is high (30%), compared to the fraction found in VLBI surveys selected at centimeter wavelengths, as expected from the predictions of unified models. The parsec-scale jets are generally found to be straight and to line up with the kiloparsec-scale jets. A few peculiar sources are discussed in detail.
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