A Quick Look at the 3 GHz Radio Sky. II. Hunting for DRAGNs in the VLA Sky Survey
A Quick Look at the 3 GHz Radio Sky. II. Hunting for DRAGNs in the VLA Sky Survey
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DOI：
10.3847/1538-4365/acda30
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发表时间：
2023-03
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通讯作者：
Y. Gordon;L. Rudnick;H. Andernach;L. Morabito;C. O’Dea;Kaylan-Marie Achong;S. Baum;Caryelis Bayona-Figueroa;E. Hooper;B. Mingo;M. E. Morris;A. Vantyghem
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作者：
Y. Gordon;L. Rudnick;H. Andernach;L. Morabito;C. O’Dea;Kaylan-Marie Achong;S. Baum;Caryelis Bayona-Figueroa;E. Hooper;B. Mingo;M. E. Morris;A. Vantyghem
活动星系核（AGN）通常可以在射电图像中被识别为两个瓣，有时通过射电射流连接到核心。不幸的是，这种多成分形态给源发现者带来了困难，导致成分成为（a）更广泛整体的独立部分，以及（b）偏离宿主星系的多波长交叉识别。在这项工作中，我们定义了一种算法 DRAGNhunter，用于从高分辨率（约 3 英寸光束尺寸）甚大阵列巡天 (VLASS) 的第一个纪元快速查看图像中的组件目录数据中识别与 AGN (DRAGN) 相关的双射电源。我们使用 DRAGNhunter 在 VLASS 中构建了超过 17,000 个 DRAGN 的目录，其中来自虚假来源的污染估计约为 11%。确定了包含我们目录中 90% 的“高保真”样本，其中污染度 <3%。宿主星系中发现了约 13,000 个 DRAGN 以及另外 234,000 个单分量射电源。利用这些数据，我们探索了 DRAGN 的特性，发现它们通常与 Fanaroff-Riley II 类源一致，并允许我们报告使用 VLASS 识别出的 31 个新巨型射电星系的发现。
Active galactic nuclei (AGNs) can often be identified in radio images as two lobes, sometimes connected to a core by a radio jet. This multicomponent morphology unfortunately creates difficulties for source finders, leading to components that are (a) separate parts of a wider whole, and (b) offset from the multiwavelength cross identification of the host galaxy. In this work we define an algorithm, DRAGNhunter, for identifying double radio sources associated with AGNs (DRAGNs) from component catalog data in the first epoch Quick Look images of the high-resolution (≈3″ beam size) Very Large Array Sky Survey (VLASS). We use DRAGNhunter to construct a catalog of >17,000 DRAGNs in VLASS for which contamination from spurious sources is estimated at ≈11%. A “high-fidelity” sample consisting of 90% of our catalog is identified for which contamination is <3%. Host galaxies are found for ≈13,000 DRAGNs as well as for an additional 234,000 single-component radio sources. Using these data, we explore the properties of our DRAGNs, finding them to be typically consistent with Fanaroff–Riley class II sources and to allow us to report the discovery of 31 new giant radio galaxies identified using VLASS.