{
  "id": "1401.1342",
  "version": "v1",
  "published": "2014-01-07T11:22:03.000Z",
  "updated": "2014-01-07T11:22:03.000Z",
  "title": "The AGN content of deep radio surveys and radio emission in radio-quiet AGN. Why every astronomer should care about deep radio fields",
  "authors": [
    "P. Padovani",
    "M. Bonzini",
    "N. Miller",
    "K. I. Kellermann",
    "V. Mainieri",
    "P. Rosati",
    "P. Tozzi",
    "S. Vattakunnel"
  ],
  "comment": "7 pages, three figures, invited talk at IAU S304, Multiwavelength AGN Surveys and Studies, Yerevan, Armenia, Oct. 7-11, 2013, to appear in the proceedings",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO",
    "astro-ph.HE"
  ],
  "abstract": "We present our very recent results on the sub-mJy radio source populations at 1.4 GHz based on the Extended Chandra Deep Field South VLA survey, which reaches ~ 30 {\\mu}Jy, with details on their number counts, evolution, and luminosity functions. The sub-mJy radio sky turns out to be a complex mix of star-forming galaxies and radio-quiet AGN evolving at a similar, strong rate and declining radio-loud AGN. While the well-known flattening of the radio number counts below 1 mJy is mostly due to star-forming galaxies, these sources and AGN make up an approximately equal fraction of the sub-mJy sky. Our results shed also light on a fifty-year-old issue, namely radio emission from radio-quiet AGN, and suggest that it is closely related to star formation, at least at z ~ 1.5 - 2. The implications of our findings for future, deeper radio surveys, including those with the Square Kilometre Array, are also discussed. One of the main messages, especially to non-radio astronomers, is that radio surveys are reaching such faint limits that, while previously they were mainly useful for radio quasars and radio galaxies, they are now detecting mostly star-forming galaxies and radio-quiet AGN, i.e., the bulk of the extragalactic sources studied in the infrared, optical, and X-ray bands.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-01-07T11:22:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "radio-quiet agn",
      "deep radio surveys",
      "deep radio fields",
      "radio emission",
      "field south vla survey"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1017/S1743921314003391"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1276273,
      "adsabs": "2014IAUS..304...79P"
    }
  }
}