{
  "id": "2212.06183",
  "version": "v1",
  "published": "2022-12-12T19:00:48.000Z",
  "updated": "2022-12-12T19:00:48.000Z",
  "title": "Systematic Broad-band X-ray Study of super-Eddington Accretion onto Supermassive Black Holes. I. X-ray Continuum",
  "authors": [
    "Alessia Tortosa",
    "Claudio Ricci",
    "Luis C. Ho",
    "Francesco Tombesi",
    "Pu Du",
    "Kohei Inayoshi",
    "Jian-Min Wang",
    "Jinyi Shangguan",
    "Ruancun Li"
  ],
  "comment": "Accepted for publication in Monthly Notices of the Royal Astronomical Society",
  "doi": "10.1093/mnras/stac3590",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "We present the first systematic broad-band X-ray study of super-Eddington accretion onto SMBHs with simultaneous {\\it NuSTAR} and {\\it XMM-Newton} or {\\it Swift}/XRT observations of a sample of 8 super-Eddington accreting AGN with Eddington ratio $1<\\lambda_{\\rm Edd}<426$. We find that the SEAMBHs show a steep primary continuum slope as expected for sources accreting in the super Eddington regime, mostly dominated by relativistic reflection. The Iron K$\\alpha$ emission lines of the sources of our sample show relativistic broadening. In addition the equivalent widths of the narrow components of the Iron K$\\alpha$ lines follow the 'X-ray Baldwin' effect, also known as the 'Iwasawa-Taniguchi' effect. We found a statistically significant correlation between the photon-index of the primary power-law and the Eddington ratio, consistent with past studies. Moreover, as expected for super-Eddington sources, the median value of the reflection fraction of the sources we analysed is a factor $\\sim 2$ higher than the median reflection fraction value of the type\\,1 AGN from the BASS sample. We are able to estimate the coronal temperature for three sources of our sample: Mrk\\,382 ($kT_e=7.8$\\,keV), PG\\,0026+129 ($kT_e=39$\\,keV) and IRAS\\,04416+1215 ($kT_e=3$\\,keV). Looking at the position of the SEAMBHs sources of our sample in the compactness-temperature diagram it appears that in super-Eddington AGN, as for lower Eddington ratio AGN, the X-ray corona is controlled by pair production and annihilation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-12-12T19:00:48.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "supermassive black holes",
      "super-eddington accretion",
      "x-ray continuum",
      "first systematic broad-band x-ray study",
      "steep primary continuum slope"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}