AGILE, Fermi, Swift, and GASP/WEBT multi-wavelength observations of the high-redshift blazar 4C +71.07 in outburst

S. Vercellone, P. Romano, G. Piano, V. Vittorini, I. Donnarumma, P. Munar-Adrover, C. M. Raiteri, M. Villata, F. Verrecchia, F. Lucarelli, C. Pittori, A. Bulgarelli, V. Fioretti, M. Tavani, J. A. Acosta-Pulido, I. Agudo, A. A. Arkharov, U. Bach, R. Bachev, G. A. BormanM. S. Butuzova, M. I. Carnerero, C. Casadio, G. Damljanovic, F. D'Ammando, A. Di Paola, V. T. Doroshenko, N. V. Efimova, S. A. Ehgamberdiev, M. Giroletti, J. L. Gómez, T. S. Grishina, E. Järvelä, S. A. Klimanov, E. N. Kopatskaya, O. M. Kurtanidze, A. Lähteenmäki, V. M. Larionov, L. V. Larionova, B. Mihov, D. O. Mirzaqulov, S. N. Molina, D. A. Morozova, S. V. Nazarov, M. Orienti, S. Righini, S. S. Savchenko, E. Semkov, L. Slavcheva-Mihova, A. Strigachev, M. Tornikoski, Y. V. Troitskaya, O. Vince, P. W. Cattaneo, S. Colafrancesco, F. Longo, A. Morselli, F. Paoletti, N. Parmiggiani

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6 Citations (Scopus)


© ESO 2019. Context. The flat-spectrum radio quasar 4C +71.07 is a high-redshift (z = 2.172), γ-loud blazar whose optical emission is dominated by thermal radiation from the accretion disc. Aims. 4C +71.07 has been detected in outburst twice by the AGILE γ-ray satellite during the period from the end of October to mid-November 2015, when it reached a γ-ray flux of the order of F(E > 100 MeV)=(1.2 ± 0.3)×10 -6 photons cm -2 s -1 and F(E > 100 MeV)=(3.1 ± 0.6)×10 -6 photons cm -2 s -1 , respectively, allowing us to investigate the properties of the jet and the emission region. Methods. We investigated its spectral energy distribution by means of almost-simultaneous observations covering the cm, mm, near-infrared, optical, ultraviolet, X-ray, and γ-ray energy bands obtained by the GASP-WEBT Consortium and the Swift, AGILE, and Fermi satellites. Results. The spectral energy distribution of the second γ-ray flare (whose energy coverage is more dense) can be modelled by means of a one-zone leptonic model, yielding a total jet power of about 4 × 10 47 erg s -1 . Conclusions. During the most prominent γ-ray flaring period our model is consistent with a dissipation region within the broad-line region. Moreover, this class of high-redshift, flat-spectrum radio quasars with high-mass black holes might be good targets for future γ-ray satellites such as e-ASTROGAM.
Original languageEnglish
Article numberA82
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Jan 2019


  • Acceleration of particles
  • Gamma rays: Galaxies
  • Quasars: Individual: 4C +71.07
  • Quasars: Supermassive black holes
  • Radiation mechanisms: non-thermal
  • Relativistic processes


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