English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The past decade has seen significant advances in wide-field cm-wave very longbaseline interferometry (VLBI), which is timely given the wide-area, synopticsurvey-driven strategy of major facilities across the electromagnetic spectrum.While wide-field VLBI poses significant post-processing challenges that canseverely curtail its potential scientific yield, many developments in thekm-scale connected-element interferometer sphere are directly applicable toaddressing these. Here we present the design, processing, data products, andsource counts from a deep (11 $\mu$Jy beam$^{-1}$), quasi-uniform sensitivity,contiguous wide-field (160 arcmin$^2$) 1.6 GHz VLBI survey of the CANDELSGOODS-North field. This is one of the best-studied extragalactic fields atmilli-arcsecond resolution and, therefore, is well-suited as a comparativestudy for our Tera-pixel VLBI image. The derived VLBI source counts showconsistency with those measured in the COSMOS field, which broadly traces theAGN population detected in arcsecond-scale radio surveys. However, there is adistinctive flattening in the $ S_{\rm 1.4GHz}\sim$100-500 $\mu$Jy flux densityrange, which suggests a transition in the population of compact faint radiosources, qualitatively consistent with the excess source counts at 15 GHz thatis argued to be an unmodelled population of radio cores. This survey approachwill assist in deriving robust VLBI source counts and broadening the discoveryspace for future wide-field VLBI surveys, including VLBI with the SquareKilometre Array, which will include new large field-of-view antennas on theAfrican continent at $\gtrsim$1000~km baselines. In addition, it may be usefulin the design of both monitoring and/or rapidly triggered VLBI transientprogrammes.

The VLBA CANDELS GOODS-North Survey. I -- Survey Design, Processing, Data Products, and Source Counts