在ORELSE巡天中z ~ 1处的扩展射电AGN：稠密环境的限制效应
Extended radio AGN at z ~ 1 in the ORELSE survey: The confining effect of dense environments
摘要：
最近的流体动力学模拟和无线电喷流的观测表明，周围环境对它们产生的形态有很大的影响。为了研究这一点，我们使用了50个扩展的射电活动星系核（ERAGN）的样本中检测到的观测红移演化在大尺度环境（ONUSE）调查。这些来源都成功地交叉识别的星系的红移范围内的$0.55 \leq z \leq 1.35$，无论是通过光谱红移或准确的光度红移。我们发现ERAGN在高密度环境中比在低密度环境中更紧凑，显著性水平为4.5 $σ$。在我们仔细研究的一系列内部属性中，只有无线电功率与其空间范围呈正相关。在消除可能的无线电功率效应后，低密度和高密度环境中的大小差异仍然存在。在全局环境分析中，大部分（86%）高密度ERAGN位于集群/组环境中。此外，在集群/组中心区域的ERAGN优先紧凑的小分散的大小相比，在集群/组中间区域和领域。总之，我们的数据似乎支持这样的解释，即在星系团的中心区域密集的团内气体在限制射电喷流的空间范围中起着重要作用。
英文摘要：
Recent hydrodynamic simulations and observations of radio jets have shown that the surrounding environment has a large effect on their resulting morphology. To investigate this we use a sample of 50 Extended Radio Active Galactic Nuclei (ERAGN) detected in the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey. These sources are all successfully cross-identified to galaxies within a redshift range of $0.55 \leq z \leq 1.35$, either through spectroscopic redshifts or accurate photometric redshifts. We find that ERAGN are more compact in high-density environments than those in low-density environments at a significance level of 4.5$σ$. Among a series of internal properties under our scrutiny, only the radio power demonstrates a positive correlation with their spatial extent. After removing the possible radio power effect, the difference of size in low- and high-density environments persists. In the global environment analyses, the majority (86\%) of high-density ERAGN reside in the cluster/group environment. In addition, ERAGN in the cluster/group central regions are preferentially compact with a small scatter in size, compared to those in the cluster/group intermediate regions and fields. In conclusion, our data appear to support the interpretation that the dense intracluster gas in the central regions of galaxy clusters plays a major role in confining the spatial extent of radio jets.
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