Nowhere to Hide: Radio-faint AGN in GOODS-N field I. Initial catalogue and radio properties (cid:63)
Nowhere to Hide: Radio-faint AGN in GOODS-N field I. Initial catalogue and radio properties (cid:63)
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无处可藏：GOODS-N 域 I 中的无线电微弱 AGN。初始目录和无线电属性（cid：63）
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
N. Wrigley
中科院分区：
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作者：
J. F. R. FF. e;M. Garrett;T. Muxlow;R. Beswick;P. Barthel;A. Deller;A. Keimpema;R. M. Campbell;N. Wrigley
上下文。活动星系核(AGN)的出现对于我们理解星系的演化和形成是至关重要的。射电观测为研究活动星系核的作用提供了一个关键的、与尘埃无关的工具。然而，传统的深fi射电测量通常具有角秒尺度的分辨率，往往不足以可靠地分离来自恒星形成和活动星系核相关活动的遥远星系的射电辐射。甚长基线干涉测量(VLBI)可以通过仅识别宇宙距离处星系中最紧密的射电发射区来解决问题，在这些区域，高亮度温度(超过105K)只能可靠地归因于活动星系核的活动。目标。我们在一系列论文中介绍了fi第一次使用新的宽fi场VLBI调查Goods-Nfield来探索微弱的紧凑型射电人口。这将在以前调查的基础上进行扩展，从而能够描述Goods-Nfield中微弱、紧凑的射电源群体的特征。欧洲VLBI网络无与伦比的灵敏度将探测到一个在深度宽fi视野VLBI观测中罕见的光度范围，从而提供对活动星系核对宇宙时间10 22WHZ−1数量级射电光度的作用的洞察。方法：研究方法。最新的VLBI技术被用来完全覆盖整个7。(CID：48)5半径区域到毫秒分辨率，而明亮射电源(S和GT；0.1mJy)从指向中心指向最多25个(CID：48)。利用多源自定标和EVN阵列的一次波束模型分别校正剩余相位误差和一次波束衰减。结果。本文介绍了货物中最大的VLBI探测源目录--N，包括31个紧凑型射电源，红移范围为0.11-3.44，几乎是本fi地区以往VLBI调查的三倍。我们提供了一个机器可读的星表，并使用e-Merlin星系演化调查(Emerge)的补充数据介绍了探测到的源的射电特性。
Context. The occurrence of active galactic nuclei (AGN) is critical to our understanding of galaxy evolution and formation. Radio observations provide a crucial, dust-independent tool to study the role of AGN. However, conventional radio surveys of deep fields ordinarily have arc-second scale resolutions often insu ffi cient to reliably separate radio emission in distant galaxies originating from star-formation and AGN-related activity. Very long baseline interferometry (VLBI) can o ff er 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. Aims. 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. This will expand upon previous surveys, permitting the characterisation of the faint, compact radio source population in 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 WHz − 1 across cosmic time. Methods. The newest VLBI techniques are used to completely cover an entire 7 . (cid:48) 5 radius area to milliarcsecond resolutions, while bright radio sources ( S > 0.1mJy) are targeted up to 25 (cid:48) 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. Results. 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).