{
  "id": "2001.02560",
  "version": "v1",
  "published": "2020-01-08T15:13:42.000Z",
  "updated": "2020-01-08T15:13:42.000Z",
  "title": "Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region",
  "authors": [
    "M. Poulain",
    "M. Paolillo",
    "D. De Cicco",
    "W. N. Brandt",
    "F. E. Bauer",
    "S. Falocco",
    "F. Vagnetti",
    "A. Grado",
    "F. Ragosta",
    "M. T. Botticella",
    "E. Cappellaro",
    "G. Pignata",
    "M. Vaccari",
    "P. Schipani",
    "G. Covone",
    "G. Longo",
    "N. R. Napolitano"
  ],
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Variability has proven to be a powerful tool to detect active galactic nuclei (AGN) in multi-epoch surveys. The new-generation facilities expected to become operational in the next few years will mark a new era in time-domain astronomy and their wide-field multi-epoch campaigns will favor extensive variability studies. We present our analysis of AGN variability in the second half of the VST survey of the Wide Chandra Deep Field South (W-CDF-S), performed in the r band 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 reliable catalog of variable AGN candidates, which will be critical targets in future variability studies. We selected a sample of optically variable sources and made use of infrared data from the Spitzer mission to validate their nature by means of color-based diagnostics. We obtain a sample of 782 AGN candidates among which 12 are classified as supernovae, 54 as stars, and 232 as AGN. We estimate a contamination $\\lesssim 20\\%$ and a completeness $\\sim 38\\%$ with respect to mid-infrared selected samples.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-01-08T15:13:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "servs/swire region",
      "variability selection",
      "wide chandra deep field south",
      "variability studies",
      "agn candidates"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}