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

AuthorsVercellone, 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, Iván ; 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, S.A.; Giroletti, M.; Gómez Fernández, 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, Sol; Morozova, D.A.; Nazarov, S.V.; Orienti, M.; Righini, S.; Savchenko, S.S.; Semkov, E.; Slavcheva-Mihova, L.
KeywordsAcceleration of particles
Relativistic processes
Radiation mechanisms: non-thermal
Quasars: Supermassive black holes
Quasars: Individual: 4C +71.07
Gamma rays: Galaxies
Issue Date2019
PublisherEDP Sciences
CitationAstronomy and Astrophysics 621:A82 (2019)
AbstractContext. 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 photons cm s and F(E > 100 MeV)=(3.1 ± 0.6)×10 photons cm s, 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 erg s. 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. © ESO 2019.
Identifiersdoi: 10.1051/0004-6361/201732532
issn: 1432-0746
Appears in Collections:(IAA) Artículos
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