The VLBA candels goods-north survey -i. survey design, processing, data products, and source counts
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Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
The past decade has seen significant advances in wide-field cm-wave very long baseline interferometry (VLBI), which is timely given the wide-area, synoptic survey-driven strategy of major facilities across the electromagnetic spectrum. While wide-field VLBI poses significant post-processing challenges that can severely curtail its potential scientific yield, man y dev elopments in the km-scale connected-element interferometer sphere are directly applicable to addressing these. Here we present the design, processing, data products, and source counts from a deep (11 μJy beam -1 ), quasi-uniform sensitivity, contiguous wide-field (160 arcmin 2 ) 1.6 GHz VLBI surv e y of the CANDELS GOODS-North field. This is one of the best-studied extragalactic fields at milli-arcsecond resolution and, therefore, is well-suited as a comparative study for our Tera-pixel VLBI image. The derived VLBI source counts show consistency with those measured in the COSMOS field, which broadly traces the AGN population detected in arcsecond-scale radio surv e ys. Ho we ver, there is a distinctive flattening in the S 1.4GHz ∼100-500 μJy flux density range, which suggests a transition in the population of compact faint radio sources, qualitatively consistent with the excess source counts at 15 GHz that is argued to be an unmodelled population of radio cores
Description
Keywords
galaxies: active, techniques: high angular resolution, techniques: interferometric, Data handling, Product design
Citation
Deane, R.P., Radcliffe, J.F., Njeri, A., Akoto-Danso, A., Bernardi, G., Smirnov, O.M., Beswick, R., Garrett, M.A., Jarvis, M.J., Whittam, I.H. and Bourke, S., 2024. The VLBA CANDELS GOODS-North Survey–I. survey design, processing, data products, and source counts. Monthly Notices of the Royal Astronomical Society, 529(3), pp.2428-2442.