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A Multiwavelength Study of Distant Blazar PKS 0537-286

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Astrophysics Aims and scope

We report the results of broadband observations of distant blazar PKS 0537-286 (z = 3.1) using data spanning more than ten years from the Fermi Large Area Telescope together with Swift UVOT/XRT archival data taken between 2005 and 2017. In the γ -ray band, the peak flux above 100 MeV, Fγ = (6 23 ± 0 56) ∙ 10-7 photon cm-2 s-1 observed on MJD 57874 within one week, corresponds to Lγ = 2 46 ∙ 1049 erg s-1 isotropic γ -ray luminosity. The Swift XRT data analyses show that the X-ray emission is characterized by a significantly hard photon index, ΓX-ray ≤ 1.3 , and an X-ray flux of 4 ∙ 10-12 erg cm-2 s-1, which is almost constant over twelve years. The spectral energy distribution is modeled within one-zone leptonic models assuming the emission region is within the broad-line region. The observed X-ray and γ -ray data are modeled as inverse Compton scattering of (i) only synchrotron photons and (ii) synchrotron and external photons on the electron population that produces the radioto-optical emission. The modeling shows that the nonthermal electrons in the jet of PKS 0537-286 have a hard power-law index (<1.9) and that the jet should be particle dominated with a luminosity within 1045-1046 erg s-1.

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Authors and Affiliations

  1. ICRANet Armenia Marshall Baghramian, Avenue 24a, 0019, Yerevan, Armenia

    N. Sahakyan, D. Israyelyan & G. Harutyunyan

  2. ICRANet Piazza, della Repubblica 10, 65122, Pescara, Italy

    N. Sahakyan

Authors
  1. N. Sahakyan
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  2. D. Israyelyan
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  3. G. Harutyunyan
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Correspondence to N. Sahakyan.

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Published in Astrofizika, Vol. 63, No. 4, pp. 521-532 (March 2014).

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Sahakyan, N., Israyelyan, D. & Harutyunyan, G. A Multiwavelength Study of Distant Blazar PKS 0537-286. Astrophysics 63, 459–469 (2020). https://doi.org/10.1007/s10511-020-09650-3

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  • DOI: https://doi.org/10.1007/s10511-020-09650-3

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