AGILE, Fermi, Swift, and GASP/WEBT multi-wavelength observations of the high-redshift blazar 4C +71.07 in outburst
Research output: Contribution to journal › Article › Scientific › peer-review
- 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
- 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.
|Number of pages||8|
|Journal||Astronomy and Astrophysics|
|Publication status||Published - 11 Jan 2019|
|MoE publication type||A1 Journal article-refereed|
- Acceleration of particles, Gamma rays: Galaxies, Quasars: Individual: 4C +71.07, Quasars: Supermassive black holes, Radiation mechanisms: non-thermal, Relativistic processes