{
  "id": "2107.13142",
  "version": "v1",
  "published": "2021-07-28T02:53:28.000Z",
  "updated": "2021-07-28T02:53:28.000Z",
  "title": "On the origin of X-ray emission in 3CRR sources: hints from mid-infrared Spitzer observations",
  "authors": [
    "Shuang-Liang Li",
    "Minfeng Gu"
  ],
  "comment": "7 pages, 7 figures, accepted for publication in A&A",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Whether X-ray emission in radio-loud (RL) AGNs is originated from disk-coronae or jets is still under debate. For example, the positive relationships in radio-quiet (RQ) AGNs (such as the optical to X-ray spectral index $\\alpha_{\\rm {OX}}$ and Eddington ration $\\lambda_{\\rm {O}}$, the X-ray photon index $\\Gamma$ and $\\lambda_{\\rm {O}}$) are not detected in RLAGNs. We intend to further investigate this issue in this work. A sample of 27 luminous sources (including 16 quasars and 11 high-excitation radio galaxies) is selected from 3CRR catalog to reinvestigate the origin of X-ray emission in RLAGNs, where the X-ray and mid-infrared fluxes are observed by Chandra/XMM-Newton and Spitzer, respectively. It is found for the first time that there is a significant relationship between the mid-infrared to X-ray spectral index $\\alpha_{\\rm {IX}}$ and $\\lambda_{\\rm {IR}}$ for whole sample, while there is no relationship between $\\alpha_{\\rm {OX}}$ and $\\lambda_{\\rm {O}}$ in quasars. There are strong positive relationships in both $L_{\\rm {R}}$-$L_{\\rm {X}}$ and $L_{\\rm {UV}}$-$L_{\\rm {X}}$ panels, which can be well fitted by the disk-corona model. However, there is no significant relationship between $\\Gamma$ and $\\lambda_{\\rm {IR}}$. The possible reason is related to the effects of large-scale magnetic field in RLAGNs. We suggest that the X-ray emission in high-excitation RLAGNs is originated from a disk-corona system.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-07-28T02:53:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray emission",
      "mid-infrared spitzer observations",
      "3crr sources",
      "x-ray spectral index",
      "significant relationship"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}