Bibcode
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.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 621, id.A82, 8 pp.
Fecha de publicación:
1
2019
Revista
Número de citas
8
Número de citas referidas
8
Descripción
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. 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)×10-6 photons cm-2
s-1 and F(E > 100 MeV)=(3.1 ±
0.6)×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 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 × 1047 erg s-1.
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 (http://www.oato.inaf.it/blazars/webt).
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Variabilidad en Núcleos Activos de Galaxias: Estudios Multifrecuencia
Los núcleos activos de galaxias (AGN por sus siglas en inglés) se caracterizan por una potente emisión proveniente de una región muy compacta (sólo pocos pcs) en el centro de la galaxia. Los "blazars" son una categoría de AGNs, caracterizados por mostrar una alta luminosidad en un amplio rango de frecuencia, desde radio a altas energías (rayos X y
José Antonio
Acosta Pulido