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

Publication date: 
Main author: 
Vercellone, S.
IAA authors: 
Agudo, I.;Gómez, J. L.;Molina, S. N.
Vercellone, S.;Romano, P.;Piano, G.;Vittorini, V.;Donnarumma, I.;Munar-Adrover, P.;Raiteri, C. M.;Villata, M.;Verrecchia, F.;Lucarelli, F.;Pittori, C.;Bulgarelli, A.;Fioretti, V.;Tavani, M.;Acosta-Pulido, J. A.;Agudo, I.;Arkharov, A. A.;Bach, U.;Bachev, R.;Borman, G. A.;Butuzova, M. S.;Carnerero, M. I.;Casadio, C.;Damljanovic, G.;D'Ammando, F.;Di Paola, A.;Doroshenko, V. T.;Efimova, N. V.;Ehgamberdiev, Sh. A.;Giroletti, M.;Gómez, J. L.;Grishina, T. S.;Järvelä, E.;Klimanov, S. A.;Kopatskaya, E. N.;Kurtanidze, O. M.;Lähteenmäki, A.;Larionov, V. M.;Larionova, L. V.;Mihov, B.;Mirzaqulov, D. O.;Molina, S. N.;Morozova, D. A.;Nazarov, S. V.;Orienti, M.;Righini, S.;Savchenko, S. S.;Semkov, E.;Slavcheva-Mihova, L.;Strigachev, A.;Tornikoski, M.;Troitskaya, Yu. V.;Vince, O.;Cattaneo, P. W.;Colafrancesco, S.;Longo, F.;Morselli, A.;Paoletti, F.;Parmiggiani, N.
Astronomy and Astrophysics
Publication type: 
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. <BR /> 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 &gt; 100 MeV)=(1.2 ± 0.3)×10<SUP>-6</SUP> photons cm<SUP>-2</SUP> s<SUP>-1</SUP> and F(E &gt; 100 MeV)=(3.1 ± 0.6)×10<SUP>-6</SUP> photons cm<SUP>-2</SUP> s<SUP>-1</SUP>, respectively, allowing us to investigate the properties of the jet and the emission region. <BR /> 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. <BR /> 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<SUP>47</SUP> erg s<SUP>-1</SUP>. <BR /> 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. Partly based on data taken and assembled by the WEBT collaboration and stored in the WEBT archive at the Osservatorio Astrofisico di Torino - INAF (<A href=''></A>).
ADS Bibcode: 
acceleration of particles;radiation mechanisms: non-thermal;relativistic processes;quasars: supermassive black holes;quasars: individual: 4C +71.07;gamma rays: galaxies;Astrophysics - High Energy Astrophysical Phenomena