Deep radio surveys of extragalactic legacy fields trace a large range of spatial and brightness temperature sensitivity scales, and therefore have differing biases to radio-emitting physical components within galaxies. This is particularly true of radio surveys performed at less than 1 arcsec angular resolutions, and so robust comparisons are necessary to better understand the biases present in each survey. We present a multi-resolution and multi-wavelength analysis of the sources detected in a new Very Long Baseline Array (VLBA) survey of the CANDELS GOODS-North field. For the 24 VLBA-selected sources described in Paper I, we augment the VLBA data with EVN data, ~0.1-1 arcsecond angular resolution data provided by VLA and e-MERLIN. This sample includes new AGN detected in this field, thanks to a new source extraction technique that adopts priors from ancillary multi-wavelength data. The high brightness temperatures of these sources (Tb > 10^6 K) confirm AGN cores, that would often be missed or ambiguous in lower-resolution radio data of the same sources. Furthermore, only 15 sources are identified as 'radiative' AGN based on available X-ray and infrared constraints. By combining VLA and VLBA measurements, we find evidence that the majority of the extended radio emission is also AGN dominated, with only 3 sources with evidence for extended potentially star-formation dominated radio emission. We demonstrate the importance of wide-field multi-resolution (arcsecond-milliarcsecond) coverage of the faint radio source population, for a complete picture of the multi-scale processes within these galaxies.
Very Long Baseline Interferometry Search for Nuclear Radio Continuum Emission in the Barred Spiral Galaxy NGC 7479
National Radio Astronomy Observatory（国家射电天文台）；Texas Tech University（德克萨斯理工大学）；Max-Planck-Institut für Radioastronomie（马克斯·普朗克射电天文研究所）；Space Telescope Science Institute（太空望远镜科学研究所）；Morehead State University（莫尔黑德州立大学）
High-resolution radio imaging of TGSSJ1530+1049, a radio galaxy in a dense environment at z=4
Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences（孔科利天文台，HUN-REN地球科学与天文学研究中心）；ELTE Eötvös Loránd University（罗兰大学）；Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University（尼古拉·哥白尼大学物理、天文与信息学院天文研究所）；Joint Institute for VLBI ERIC（甚长基线干涉测量联合研究所）；Faculty of Aerospace Engineering, Delft University of Technology（代尔夫特理工大学航空航天工程学院）；Department of Physics, University of Oxford（牛津大学物理系）；Department of Physics and Astronomy, University College London（伦敦大学学院物理与天文系）
