无处可藏：GOODS-N字段中的无线电微弱AGN。I.初始星表和射电性质
Nowhere to Hide: Radio-faint AGN in the GOODS-N field. I. Initial catalogue and radio properties
摘要：
传统的深场射电观测通常具有角秒尺度的分辨率，通常不足以可靠地分离遥远星系中源自恒星形成和活动星系核相关活动的射电辐射。甚长基线干涉测量（VLBI）可以提供一个解决方案，通过确定在宇宙学距离的星系中最紧凑的无线电发射区，其中高亮度温度（超过$10^5$ K）只能可靠地归因于活动星系核活动。我们提出了一系列的论文中的第一个探索微弱的紧凑的无线电人口使用一个新的宽视场VLBI调查的GOODS-N字段。欧洲VLBI网络（EVN）无与伦比的灵敏度将探测在深宽场VLBI观测中罕见的光度范围，从而深入了解活动星系核在整个宇宙时间内对$10^{22}~\mathrm{W\,Hz^{-1}}$级射电光度的作用。最新的VLBI技术用于以毫角秒的分辨率完全覆盖整个7'.5半径区域，而明亮的射电源（$S > 0.1$ mJy）则被瞄准到距指向中心25弧分的地方。多源自校准和EVN阵列的初级波束模型分别用于校正残余相位误差和初级波束衰减。本文介绍了GOODS-N中最大的VLBI探测源目录，包括31个红移范围为0.11 - 3.44的致密射电源，几乎是该领域以前VLBI调查的三倍。我们提供了一个机器可读的目录，并介绍了无线电特性的检测源使用补充数据从e-MERLIN星系演化调查（eMERGE）。
英文摘要：
(Abridged) Conventional radio surveys of deep fields ordinarily have arc-second scale resolutions often insufficient to reliably separate radio emission in distant galaxies originating from star-formation and AGN-related activity. Very long baseline interferometry (VLBI) can offer a solution by identifying only the most compact radio emitting regions in galaxies at cosmological distances where the high brightness temperatures (in excess of $10^5$ K) can only be reliably attributed to AGN activity. We present the first in a series of papers exploring the faint compact radio population using a new wide-field VLBI survey of the GOODS-N field. The unparalleled sensitivity of the European VLBI Network (EVN) will probe a luminosity range rarely seen in deep wide-field VLBI observations, thus providing insights into the role of AGN to radio luminosities of the order $10^{22}~\mathrm{W\,Hz^{-1}}$ across cosmic time. The newest VLBI techniques are used to completely cover an entire 7'.5 radius area to milliarcsecond resolutions, while bright radio sources ($S > 0.1$ mJy) are targeted up to 25 arcmin from the pointing centre. Multi-source self-calibration, and a primary beam model for the EVN array are used to correct for residual phase errors and primary beam attenuation respectively. This paper presents the largest catalogue of VLBI detected sources in GOODS-N comprising of 31 compact radio sources across a redshift range of 0.11-3.44, almost three times more than previous VLBI surveys in this field. We provide a machine-readable catalogue and introduce the radio properties of the detected sources using complementary data from the e-MERLIN Galaxy Evolution survey (eMERGE).
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