{
  "id": "2006.01079",
  "version": "v1",
  "published": "2020-06-01T17:02:22.000Z",
  "updated": "2020-06-01T17:02:22.000Z",
  "title": "The X-ray emission in young radio AGNs",
  "authors": [
    "Mai Liao",
    "Minfeng Gu",
    "Minhua Zhou",
    "Liang Chen"
  ],
  "comment": "15 pages,10 figures, 3 tables, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "In this work, we investigated the X-ray emission for a sample of young radio AGNs by combining their data from Chandra/XMM-Newton and at other wavebands. We find strong correlations between the X-ray luminosity $L_{\\rm X}$ in 2$-$10 keV and the radio luminosities $L_{\\rm R}$ at 5 GHz for VLBI radio-core, VLA radio-core and FIRST component, indicating that both pc- and kpc-scale radio emission strongly correlate with X-ray emission in these sources. We find approximately linear dependence of radio on X-ray luminosity in the sources with radiative efficient accretion flows (i.e., the Eddington ratio $R_{\\rm edd} \\gtrsim 10^{-3} $) with b $\\sim$ 1 ($L_{\\rm R}$ $\\propto$ $L_{\\rm X} ^{b}$) and $\\xi_{\\rm RX}$ $\\sim$ 1 in fundamental plane using VLBI data, where the dependence is consistent with the re-analysed result on the previous study in \\cite{2016ApJ...818..185F} at $R_{\\rm edd} \\gtrsim 10^{-3}$, however is significantly deviated from the theoretical prediction of accretion flow as the origin of X-ray emission. In contrast to radio-quiet quasars, there is no significant correlation between $\\Gamma$ and Eddington ratio. Our results seem to indicate that the X-ray emission of high-accreting young radio AGNs may be from jet. We constructed the SEDs for 18 sources (most are in radiative efficient accretion) including 9 galaxies and 9 quasars with high-quality X-ray data, and find that the X-ray emission of most quasars is more luminous than that of normal radio-quiet quasars. This is clearly seen from the quasar composite SED, of which the X-ray emission is apparently higher than that of radio-quiet quasars, likely supporting the jet-related X-ray emission in young radio AGNs. The scenario that the X-ray emission is from self-synchrotron Compton (SSC) is discussed.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-06-01T17:02:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray emission",
      "young radio agns",
      "radiative efficient accretion",
      "eddington ratio",
      "x-ray luminosity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}