2.3 GHz长基线校准器的特性
Characterisation of Long Baseline Calibrators at 2.3 GHz
摘要：
我们提出了一个详细的多历元分析的31个潜在的南半球无线电校准，最初观察到的一部分，以维持国际天体参考系（ICRF）的计划。在射电波长上，主要的校准器是活动星系核（AGN），这是存在于大多数星系中心的强大射电发射器。已知它们在观测到的所有波长处都是变化的。通过确定这些活动星系核的射电源结构和可变性的量，我们确定它们作为2.3 GHz长基线射电干涉测量的相位校准器的适用性。为此，我们使用了一组互补的指标，将这31个南方来源分为五类有关其适合VLBI校准。我们发现，在我们的样本中的所有来源将是很好的干涉校准，几乎百分之九十将是非常好的校准。
英文摘要：
We present a detailed multi-epoch analysis of 31 potential southern hemisphere radio calibrators that were originally observed as part of a program to maintain the International Celestial Reference Frame (ICRF). At radio wavelengths, the primary calibrators are Active Galactic Nuclei (AGN), powerful radio emitters which exist at the centre of most galaxies. These are known to vary at all wavelengths at which they have been observed. By determining the amount of radio source structure and variability of these AGN, we determine their suitability as phase calibrators for long baseline radio interferometry at 2.3 GHz. For this purpose, we have used a set of complementary metrics to classify these 31 southern sources into five categories pertaining to their suitability as VLBI calibrators. We find that all of the sources in our sample would be good interferometric calibrators and almost ninety per cent would be very good calibrators.
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