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Astrophysics

, Volume 61, Issue 2, pp 160–170 | Cite as

High-Energy γ -Ray Emission from PKS 0625-35

  • V. Baghmanyan
  • M. Tumanyan
  • N. Sahakyan
  • Y. Vardanyan
Article

We present the γ -ray observations of the radio galaxy PKS 0625-35, using the Fermi Large Area Telescope data accumulated during 2008-2017. γ -rays up to 100 GeV have been detected with a detection significance of about 32.3σ . A power law spectrum with a photon index of 1.88±0.04 and an integrated flux of Fγ = (1.02 ± 0.10)×10-8 photon cm-2 s-1 above 100 MeV well describes the data averaged over 9 years of observations. There is a hint of deviation from a simple power-law shape around tens of GeV energies; however, the low statistics does not allow one to reject power law modeling. The spectral energy distributions during high and low X-ray states are modeled using one-zone leptonic models that include the synchrotron, synchrotron self Compton processes; the model parameters are estimated using the Markov Chain Monte Carlo method. The modeling shows that in the jet of PKS 0625-35 the particles (electrons) are accelerated to energies higher than 50 TeV.

Keywords

PKS 0625-35: γ -rays: radio galaxy 

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References

  1. 1.
    C. M. Urry and P. Padovani, Publ. Astron. Soc. Pacif., 107, 803, 1995.ADSCrossRefGoogle Scholar
  2. 2.
    A. A. Abdo, M. Ackermann et al., Astrophys. J., 719, 1433, 2010a.ADSCrossRefGoogle Scholar
  3. 3.
    A. A. Abdo, M. Ackermann et al., Astrophys. J., 707, 55, 2009a.ADSCrossRefGoogle Scholar
  4. 4.
    A. A. Abdo, M. Ackermann et al., Astrophys. J., 699, 31, 2009b.ADSCrossRefGoogle Scholar
  5. 5.
    A. A. Abdo, M. Ackermann, M. Ajello et al., Astrophys. J. Suppl. Ser., 188, 405, 2010b.ADSCrossRefGoogle Scholar
  6. 6.
    A. A. Abdo, M. Ackermann et al., Astrophys. J., 720, 912, 2010c.ADSCrossRefGoogle Scholar
  7. 7.
    F. Aharonian, A. Akhperjanian et al., Astrophys. J., 695, L40, 2009.ADSCrossRefGoogle Scholar
  8. 8.
    F. Aharonian, A. Akhperjanian et al., Science, 314, 1424, 2006.ADSCrossRefGoogle Scholar
  9. 9.
    J. Aleksíc, E. A. Alvarez et al., Astron. Astrophys., 539, L2, 2012.ADSCrossRefGoogle Scholar
  10. 10.
    M. Dyrda, A. Wierzcholska et al., on behalf of the H.E.S.S. collaboration, Proceedings of ICRC2015, arXiv:1509.06851, 2015.Google Scholar
  11. 11.
    P. Jones et al., The 6dF Galaxy Survey: final redshift release (DR3) and southern large-scale, 2009.Google Scholar
  12. 12.
    B. L. Fanaroff, J. M. Riley, Mon. Not. Roy. Astron. Soc., 167, 31P, 1974.ADSCrossRefGoogle Scholar
  13. 13.
    W. B. Atwood, A. A. Abdo, M. Ackermann et al., Astrophys. J., 697, 1071, 2009.ADSCrossRefGoogle Scholar
  14. 14.
    N. Gehrels, G. Chincarini, P. Giommi et al., AIP Conf. Proc., 727, 637, 2004.ADSCrossRefGoogle Scholar
  15. 15.
    N. Fitzpatrick, Publ. Astron. Soc. Pacif., 111, 63, 1999.ADSCrossRefGoogle Scholar
  16. 16.
    T. Poole, A. Breeveld, M. Page et al., Mon. Not. Roy. Astron. Soc., 383, 627, 2008.Google Scholar
  17. 17.
    A. A. Breeveld, W. Landsman, S. T. Holland et al., AIP Conf. Proc., 1358, 373, 2011.ADSCrossRefGoogle Scholar
  18. 18.
    A. A. Abdo, M. Ackermann et al., Astrophys. J., 699, 976, 2009c.ADSCrossRefGoogle Scholar
  19. 19.
    A. A. Abdo, M. Ackermann et al., Science, 328, 725, 2010d.ADSCrossRefGoogle Scholar
  20. 20.
    N. Sahakyan, D. Zargaryan, and V. Baghmanyan, Astron. Astrophys., 574, A88, 2015.ADSCrossRefGoogle Scholar
  21. 21.
    Y. T. Tanaka, A. Doi, Y. Inoue et al., Astrophys. J., 799, L18, 2015.ADSCrossRefGoogle Scholar
  22. 22.
    L. Maraschi, G. Ghisellini, and A. Celotti, Astrophys. J., 397, L5, 1992.ADSCrossRefGoogle Scholar
  23. 23.
    S. D. Bloom and A. P. Marscher, Astrophys. J., 461, 657, 1996.ADSCrossRefGoogle Scholar
  24. 24.
    G. Ghisellini, L. Maraschi, and A. Treves, Astron. Astrophys., 146, 204, 1985.ADSGoogle Scholar
  25. 25.
    S. Inoue and F. Takahara, Astrophys. J., 463, 555, 1996.ADSCrossRefGoogle Scholar
  26. 26.
    V. Zabalza, Proceedings of ICRC2015, arXiv:1509.06851, 2015.Google Scholar
  27. 27.
    F. A. Aharonian, S. R. Kelner, and A. Y. Prosekin, Phys. Rev. D, 82, 043002, 2010.ADSCrossRefGoogle Scholar
  28. 28.
    F. A. Aharonian and A. M. Atoyan, Astrophys. J. Suppl. Ser., 79, 321, 1981.Google Scholar
  29. 29.
    B. Mingo, M. J. Hardcastle, J. H. Croston et al., Mon. Not. Roy. Astron. Soc., 440, 269, 2013.ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • V. Baghmanyan
    • 1
  • M. Tumanyan
    • 1
    • 2
  • N. Sahakyan
    • 1
    • 2
  • Y. Vardanyan
    • 3
  1. 1.ICRANetYerevanArmenia
  2. 2.ICRANetPescaraItaly
  3. 3.Yerevan State UniversityYerevanArmenia

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