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

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.

Keywords

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

DOI

10.1051/0004-6361/201732532

Citation

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 observationsof the high-redshift blazar 4C +71.07 in outburst ' , Astronomy and Astrophysics , vol. 621 , 82 . https://doi.org/10.1051/0004-6361/201732532

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-201902251957

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[article-cris] Sähkötekniikan korkeakoulu / ELEC

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