{
  "id": "1711.09775",
  "version": "v1",
  "published": "2017-11-24T06:42:52.000Z",
  "updated": "2017-11-24T06:42:52.000Z",
  "title": "A Study of Outflows in Luminous Quasars at Redshift $\\sim0.4-0.8$",
  "authors": [
    "J. Wang",
    "D. W. Xu",
    "J. Y. Wei"
  ],
  "comment": "17 pages, 8 figures, and 2 tables. To be published in ApJ. arXiv admin note: text overlap with arXiv:1512.01920",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We perform a systematic study of outflow in the narrow-line region (NLR) of active galactic nuclei (AGNs) at $z\\sim0.4-0.8$ basing upon a large sample of $\\sim900$ quasars at $z\\sim 0.4-0.8$. The sample is extracted from the Sloan Digital Sky Survey by mainly requiring 1) the g-band magnitude is brighter than 19 magnitude; and 2) the [OIII]$\\lambda5007$ emission line has a signal-to-noise ration larger than 30. Profiles of multiple emission lines are modeled by a sum of several Gaussian functions. The spectral analysis allows us to identify 1) a prevalence of both [OIII]$\\lambda5007$ line blue asymmetry and bulk velocity blueshift of both [NeIII]$\\lambda3869$ and [NeV]$\\lambda3426$ lines, when the [\\ion{O}{2}]$\\lambda3727$ line is used as a reference. The velocity offset of [\\ion{O}{3}]$\\lambda5007$ line is, however, distributed around zero value, except for a few outliers. 2) not only the significant [OIII]$\\lambda5007$ line asymmetry, but also the large bulk velocity offsets of [NeIII]$\\lambda3869$ and [NeV]$\\lambda3426$ emission lines tend to occur in the objects with high $L/L_{\\mathrm{Edd}}$, which is considerably consistent with the conclusions based on local AGNs. With three $M_{\\mathrm{BH}}$ estimation methods, the significance level of the trend is found to be better than $2.9\\sigma$, $3.2\\sigma$ and $1.8\\sigma$ for [OIII], [NeIII] and [NeV], respectively. \\rm After excluding the role of radio jets, the revealed dependence of NLR gas outflow on $L/L_{\\mathrm{Edd}}$ allows us to argue that the pressure caused by the wind/radiation launched/emitted from central supermassive black hole is the most likely origin of the outflow in these distant quasars, which implies that the outflow in luminous AGNs up to $z\\sim1$ have the same origin.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-11-24T06:42:52.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "luminous quasars",
      "large bulk velocity offsets",
      "sloan digital sky survey",
      "emission lines tend",
      "central supermassive black hole"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}