NVSS和WENSS巡天新射电晕和遗迹的射电连续观测
Radio continuum observations of new radio halos and relics from the NVSS and WENSS surveys
摘要：
射电晕和遗迹是在星系团中发现的弥散射电源，在X射线波长处显示出重要的子结构。这些来源提供了有关ICM中发生的非热过程的重要信息。到目前为止，只有几十个遗迹和光环是已知的，而模型预测，这些来源存在的数量要多得多。本文介绍了在星系团中寻找新的漫射射电源的广泛观测活动的结果。我们发现了6个新的射电遗迹，包括一个可能的双遗迹系统和2个射电晕。此外，我们还证实了四个星系团中存在弥散射电辐射。通过构建35个射电遗迹样本，我们发现遗迹大多沿着ICM的X射线发射主轴发现，而他们的方向是垂直于这个轴。这与遗迹追踪合并冲击波的情景一致。与NORAS-REFLEX样本相比，有遗迹的ICM样本的长短轴比分布也更宽。我们比较了X射线光度和红移分布的集群与文物的X射线选择样本的NORAS和反射调查。我们发现了初步的证据，集群的遗迹分数与X射线光度和红移的增加。[删节]
英文摘要：
Radio halos and relics are diffuse radio sources found in galaxy clusters showing significant substructure at X-ray wavelengths. These sources provide important information about non-thermal processes taking place in the ICM. Until now only a few dozen relics and halos are known, while models predict that a much larger number of these sources exist. In this paper we present the results of an extensive observing campaign to search for new diffuse radio sources in galaxy clusters. We discovered 6 new radio relics, including a probable double relic system, and 2 radio halos. In addition, we confirm the presence of diffuse radio emission in four galaxy clusters. By constructing a sample of 35 radio relics we find that relics are mostly found along the major axis of the X-ray emission from the ICM, while their orientation is perpendicular to this axis. This is consistent with the scenario that relics trace merger shock waves. The major and minor axis ratio distribution of the ICM for clusters with relics is also broader than that of the NORAS-REFLEX sample. We compared the X-ray luminosity and redshift distributions of clusters with relics to an X-ray selected sample from the NORAS and REFLEX surveys. We find tentative evidence for an increase of the cluster's relic fraction with X-ray luminosity and redshift. [abridged]
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