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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/035/03/0231-0235

    • Keywords

       

      Galaxies: active-galaxies: BL Lacertae objects; galaxies: quasars; galaxies: jets; Fermi (LAT)

    • Abstract

       

      The most identified sources observed by Fermi/LAT are blazars, based on which we can investigate the emission mechanisms and beaming effect in the 𝛾-ray bands for blazars. Here, we used the compiled around 450 Fermi blazars with the available X-ray observations to estimate their Doppler factors and compared them with the integral 𝛾-ray luminosity in the range of 1–100 GeV. It is interesting that the integral 𝛾-ray luminosity is closely correlated with the estimated Doppler factor, log 𝑣𝛾 𝐿𝑣𝛾 = (2.95 ± 0.09) log 𝛿 + 43.59 ± 0.08 for the whole sample. When the dependence of the correlation between them and the X-ray luminosity is removed, the correlation is still strong, which suggests that the 𝛾-ray emissions are strongly beamed.

    • Author Affiliations

       

      J. H. Fan1 2 D. Bastieri3 J. H. Yang1 4 Y. Liu1 2 D. X. Wu1 2 S. H. Li1 2

      1. Center for Astrophysics, Guangzhou University, Guangzhou 510006, China.
      2. Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province, Guangzhou 510006, China.
      3. Dipartimento di Fisica & Astronomia, Universita di Padova, Padova, Italy.
      4. Department of Physics and Electronic Science, Hunan University of Arts and Science, Changde 415000, China.
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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