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

Research output: Contribution to journalArticleScientificpeer-review


  • 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. Borman
  • M. 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
  • S. A. Klimanov
  • E. N. Kopatskaya
  • O. M. Kurtanidze
  • 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
  • Y. V. Troitskaya
  • O. Vince
  • P. W. Cattaneo
  • S. Colafrancesco
  • F. Longo
  • A. Morselli
  • F. Paoletti
  • N. Parmiggiani

Research units

  • Osservatorio Astronomico di Brera
  • Autonomous University of Barcelona
  • Osservatorio Astronomico di Torino
  • Osservatorio Astronomico Roma
  • Università di Roma Tor Vergata
  • Instituto Astrofisico de Canarias
  • University of La Laguna
  • CSIC
  • RAS - Pulkovo Astronomical Observatory
  • Bulgarian Academy of Sciences
  • Crimean Astrophysical Observatory
  • University of Belgrade
  • Alma Mater Studiorum Universita di Bologna
  • Lomonosov Moscow State University
  • Academy of Sciences of the Republic of Uzbekistan
  • St. Petersburg State University
  • Georgian National Academy of Sciences
  • Kazan Federal University
  • Guangzhou University
  • CAS - National Astronomical Observatories
  • University of the Witwatersrand
  • Università Degli Studi di Trieste
  • Universit'a di Rome Sapienza
  • ASI Science Data Center
  • INAF/IASF Bologna
  • Gran Sasso Science Institute
  • Max-Planck-Institut für Radioastronomie
  • INFN Pavia
  • Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy


Context. The flat-spectrum radio quasar 4C +71.07 is a high-redshift (z = 2.172), gamma-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 gamma-ray satellite during the period from the end of October to mid-November 2015, when it reached a gamma-ray flux of the order of F(E > 100 MeV) = (1.2 +/- 0.3) x 10(-6) photons cm (2) s(-1) and F(E > 100 MeV) = (3.1 +/- 0.6) x 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 gamma-ray energy bands obtained by the GASP-WEBT Consortium and the Swift, AGILE, and Fermi satellites.

Results. The spectral energy distribution of the second gamma-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 x 10(47) erg s(-1).

Conclusions. During the most prominent gamma-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 gamma-ray satellites such as e-ASTROGAM.


Original languageEnglish
Article number82
Number of pages8
JournalAstronomy and Astrophysics
Publication statusPublished - 11 Jan 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • 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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