{
  "id": "2010.12595",
  "version": "v1",
  "published": "2020-10-23T18:03:18.000Z",
  "updated": "2020-10-23T18:03:18.000Z",
  "title": "Coronal Line Forest AGN I: physical properties of the emission-line regions",
  "authors": [
    "F. C. Cerqueira-Campos",
    "A. Rodríguez-Ardila",
    "R. Riffell",
    "M. Marinello",
    "A. Prieto",
    "L. G. Dahmer-Hahn"
  ],
  "comment": "30 pages, 25 figures, to be published in MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Coronal-Line Forest Active Galactic Nuclei (CLiF AGN) are characterized by strong high-ionization lines, which contrast to what is found in most AGNs. Here, we carry out a multiwavelength analysis aimed at understanding the physical processes in the Narrow Line Region (NLR) of these objects and unveiling if they are indeed a special class of AGN. By comparing coronal emission-line ratios we conclude that there are no differences between CLiF and non-CLiF AGNs. We derive physical conditions of the narrow line region (NLR) gas and found electron densities in the range $3.6\\times$10$^{2}$ - $1.7\\times$10$^{4}$ cm$^{-3}$ and temperatures of $3.7\\times$10$^{3}$ - $6.3\\times$10$^{4}$ K, suggesting that the ionization mechanism is associated primarily with photoionization by the AGN. We suggest a NLR dominated by matter-bounded clouds to explain the high-ionization line spectrum observed. The mass of the central black hole, derived from the stellar velocity dispersion show that most of the objects have values in the interval 10$^{7-8}$~M$\\odot$. Our results imply that CLiF AGN is not a separate category of AGNs. In all optical/near-infrared emission-line properties analyzed, they represent an extension to the low/high ends of the distribution within the AGN class.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-10-23T18:03:18.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "coronal line forest agn",
      "emission-line regions",
      "physical properties",
      "narrow line region",
      "coronal-line forest active galactic nuclei"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 30,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}