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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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en

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8

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Astronomy and Astrophysics, Volume 621

Abstract

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.

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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, S 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, Y V, Vince, O, Cattaneo, P W, Colafrancesco, S, Longo, F, Morselli, A, Paoletti, F & Parmiggiani, N 2019, 'AGILE, Fermi, Swift, and GASP/WEBT multi-wavelength observations of the high-redshift blazar 4C +71.07 in outburst', Astronomy and Astrophysics, vol. 621, 82. https://doi.org/10.1051/0004-6361/201732532