{
  "id": "2401.03479",
  "version": "v1",
  "published": "2024-01-07T13:12:00.000Z",
  "updated": "2024-01-07T13:12:00.000Z",
  "title": "Lobe-dominated gamma-ray Emission of Compact Symmetric Objects",
  "authors": [
    "Ying-Ying Gan",
    "Hai-Ming Zhang",
    "Xing Yang",
    "Ying Gu",
    "Jin Zhang"
  ],
  "comment": "19 Pages, 5 Figures, 4 Tables, Accepted by RAA",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The $\\gamma$-ray emitting compact symmetric objects (CSOs) PKS 1718--649, NGC 3894, and TXS 0128+554 are lobe-dominated in the radio emission. In order to investigate their $\\gamma$-ray radiation properties, we analyze the $\\sim$14-yr Fermi/LAT observation data of the three CSOs. They all show the low luminosity ($10^{41}-10^{43}$ erg s$^{-1}$) and no significant variability in the $\\gamma$-ray band. Their $\\gamma$-ray average spectra can be well fitted by a power-law function. These properties of $\\gamma$-rays are clearly different from the $\\gamma$-ray emitting CSOs CTD 135 and PKS 1413+135, for which the $\\gamma$-rays are produced by a restarted aligned jet. In the $L_{\\gamma}-\\Gamma_{\\gamma}$ plane, the three CSOs are also located at the region occupied by radio galaxies (RGs) while CTD 135 and PKS 1413+135 display the similar feature to blazars. Together with the similar radio emission property to $\\gamma$-ray emitting RGs Cen A and Fornax A, we speculate that the $\\gamma$-rays of the three CSOs stem from their extended mini-lobes. The broadband spectral energy distributions of the three CSOs can be well explained by the two-zone leptonic model, where their $\\gamma$-rays are produced by the inverse Compton process of the relativistic electrons in extended region. By extrapolating the observed Fermi/LAT spectra to the very high energy band, we find that TXS 0128+554 among the three CSOs may be detected by the Cherenkov Telescope Array in future.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-01-07T13:12:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "lobe-dominated gamma-ray emission",
      "broadband spectral energy distributions",
      "similar radio emission property",
      "ray emitting compact symmetric objects",
      "inverse compton process"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}