{
  "id": "1409.1580",
  "version": "v1",
  "published": "2014-09-04T20:00:13.000Z",
  "updated": "2014-09-04T20:00:13.000Z",
  "title": "A Census of Gas Outflows in Type 2 Active Galactic Nuclei",
  "authors": [
    "Hyun-Jin Bae",
    "Jong-Hak Woo"
  ],
  "comment": "12 pages, 10 figures; Accepted to ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We perform a census of ionized gas outflows using a sample of ~23,000 type 2 active galactic nuclei (AGNs) out to z~0.1. By measuring the velocity offset of narrow emission lines, i.e., [O III] {\\lambda}5007 and H{\\alpha}, with respect to the systemic velocity measured from the stellar absorption lines, we find that 47% of AGNs display an [O III] line-of-sight velocity offset $\\geq$ 20 km/s. The fraction of the [O III] velocity offset in type 2 AGNs is comparable to that in type 1 AGNs after considering the projection effect. AGNs with a large [O III] velocity offset preferentially have a high Eddington ratio, implying that the detected velocity offsets are related to black hole activity. The distribution of the host galaxy inclination is clearly different between the AGNs with blueshifted [O III] and the AGNs with redshifted [O III], supporting the combined model of the biconical outflow and dust obscuration. In addition, for ~3% of AGNs, [O III] and H{\\alpha} show comparable large velocity offsets, indicating a more complex gas kinematics than decelerating outflows in a stratified narrow-line region.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-09-04T20:00:13.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "active galactic nuclei",
      "gas outflows",
      "narrow emission lines",
      "comparable large velocity offsets",
      "line-of-sight velocity offset"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/795/1/30",
      "journal": "The Astrophysical Journal",
      "year": 2014,
      "month": "Nov",
      "volume": 795,
      "number": 1,
      "pages": 30
    },
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014ApJ...795...30B"
    }
  }
}