{
  "id": "2005.09077",
  "version": "v1",
  "published": "2020-05-18T20:53:09.000Z",
  "updated": "2020-05-18T20:53:09.000Z",
  "title": "Broad-band X-ray observation of broad-line radio galaxy 3C 109",
  "authors": [
    "Sulov Chalise",
    "Anne M. Lohfink",
    "Erin Kara",
    "Andy C. Fabian"
  ],
  "comment": "13 pages, 8 figures",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "We present a study of the central engine in the broad-line radio galaxy 3C 109. To investigate the immediate surrounding of this accreting, supermassive black hole, we perform a multi-epoch broad-band spectral analysis of a joint NuSTAR/XMM observation (2017), an archival xmm observation (2005) and the 105-month averaged Swift-BAT data. We are able to clearly separate the spectrum into a primary continuum, neutral and ionized absorption, and a reflection component. The photon index of the primary continuum has changed since 2005 ($\\Gamma = 1.61 \\substack{+0.02 \\\\ -0.01} \\rightarrow 1.54 \\pm{0.02}$), while other components remain unchanged, indicative of minimal geometric changes to the central engine. We constrain the high-energy cutoff of 3C 109 (E$_{\\text{cut}}= 49 \\substack{+7 \\\\ -5}$\\,keV ) for the first time. The reflector is found to be ionized (log $\\xi$ = $2.3 \\substack{+0.1 \\\\ -0.2}$) but no relativistic blurring is required by the data. SED analysis confirms the super-Eddington nature of 3C 109 initially ($\\lambda_{Edd} >$ 2.09). However, we do not find any evidence for strong reflection (R = $0.18 \\substack{+0.04 \\\\ -0.03}$) or a steep power law index, as expected from a super-Eddington source. This puts the existing virial mass estimate of 2 $\\times 10^{8}$M$_{\\odot}$ into question. We explore additional ways of estimating the Eddington ratio, some of which we find to be inconsistent with our initial SED estimate. We obtain a new black hole mass estimate of 9.3 $\\times 10^{8}$M$_{\\odot}$, which brings all Eddington ratio estimates into agreement and does not require 3C 109 to be super-Eddington.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-05-18T20:53:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "broad-line radio galaxy 3c",
      "broad-band x-ray observation",
      "central engine",
      "steep power law index",
      "black hole mass estimate"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}