{
  "id": "2204.09908",
  "version": "v1",
  "published": "2022-04-21T06:34:29.000Z",
  "updated": "2022-04-21T06:34:29.000Z",
  "title": "XMM-Newton Observations of the Narrow-Line Seyfert 1 Galaxy IRAS 13224$-$3809 : X-ray Spectral Analysis II",
  "authors": [
    "Jiachen Jiang",
    "Thomas Dauser",
    "Andrew C. Fabian",
    "William N. Alston",
    "Luigi C. Gallo",
    "Michael L. Parker",
    "Christopher S. Reynolds"
  ],
  "comment": "17 pages, 15 figures including appendices; accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "Previously, we modelled the X-ray spectra of the narrow-line Seyfert 1 galaxy IRAS 13224$-$3809 using a disc reflection model with a fixed electron density of $10^{15}$ cm$^{-3}$. An additional blackbody component was required to fit the soft X-ray excess below 2 keV. In this work, we analyse simultaneously five flux-resolved XMM-Newton spectra of this source comprising data collected over 2 Ms. A disc reflection model with an electron density of $n_{\\rm e}\\approx10^{20}$ cm$^{-3}$ and an iron abundance of $Z_{\\rm Fe}=3.2\\pm0.5Z_{\\odot}$ is used to fit the broad-band spectra of this source. No additional component is required to fit the soft excess. Our best-fit model provides consistent measurements of black hole spin and disc inclination angle as in previous models where a low disc density was assumed. In the end, we calculate the average illumination distance between the corona and the reflection region in the disc of IRAS 13224$-$3809 based on best-fit density and ionisation parameters, which changes from 0.43$\\sqrt{f_{\\rm AD}/f_{\\rm INF}}$ $r_{\\rm g}$ in the lowest flux state to 1.71$\\sqrt{f_{\\rm AD}/f_{\\rm INF}}$ $r_{\\rm g}$ in the highest flux state assuming a black hole mass of $2\\times10^{6}M_{\\odot}$. $f_{\\rm AD}/f_{\\rm INF}$ is the ratio between the flux of the coronal emission that reaches the accretion disc and infinity. This ratio depends on the geometry of the coronal region in IRAS 13224$-$3809. So we only discuss its value based on the simple `lamp-post' model, although detailed modelling of the disc emissivity profile of IRAS 13224$-$3809 is required in future to reveal the exact geometry of the corona.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-04-21T06:34:29.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray spectral analysis",
      "galaxy iras",
      "narrow-line seyfert",
      "xmm-newton observations",
      "disc reflection model"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}