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Variability has proven to be a powerful tool to detect active galactic nuclei(AGN) in multi-epoch surveys. The new-generation facilities expected to becomeoperational in the next few years will mark a new era in time-domain astronomyand their wide-field multi-epoch campaigns will favor extensive variabilitystudies. We present our analysis of AGN variability in the second half of theVST survey of the Wide Chandra Deep Field South (W-CDF-S), performed in the rband and covering a 2 sq. deg. area. The analysis complements a previous work,in which the first half of the area was investigated. We provide a reliablecatalog of variable AGN candidates, which will be critical targets in futurevariability studies. We selected a sample of optically variable sources andmade use of infrared data from the Spitzer mission to validate their nature bymeans of color-based diagnostics. We obtain a sample of 782 AGN candidatesamong which 12 are classified as supernovae, 54 as stars, and 232 as AGN. Weestimate a contamination $\lesssim 20\%$ and a completeness $\sim 38\%$ withrespect to mid-infrared selected samples.

Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region