Pittori, C.; Lucarelli, F.; Verrecchia, F.; Raiteri, C. M.; Villata, M.; Vittorini, V.; Tavani, M.; Puccetti, S.; Perri, M.; Donnarumma, I.; Vercellone, S.; Acosta-Pulido, J. A.; Bachev, R.; Benítez, E.; Borman, G. A.; Carnerero, M. I.; Carosati, D.; Chen, W. P.; Ehgamberdiev, Sh. A.; Goded, A.; Grishina, T. S.; Hiriart, D.; Hsiao, H. Y.; Jorstad, S. G.; Kimeridze, G. N.; Kopatskaya, E. N.; Kurtanidze, O. M.; Kurtanidze, S. O.; Larionov, V. M.; Larionova, L. V.; Marscher, A. P.; Mirzaqulov, D. O.; Morozova, D. A.; Nilsson, K.; Samal, M. R.; Sigua, L. A.; Spassov, B.; Strigachev, A.; Takalo, L. O.; Antonelli, L. A.; Bulgarelli, A.; Cattaneo, P.; Colafrancesco, S.; Giommi, P.; Longo, F.; Morselli, A.; Paoletti, F.
Bibliographical reference
The Astrophysical Journal, Volume 856, Issue 2, article id. 99, 9 pp. (2018).
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Description
We report the AGILE detection and the results of the multifrequency
follow-up observations of a bright γ-ray flare of the blazar 3C
279 in 2015 June. We use AGILE and Fermi gamma-ray data, together with
Swift X-ray andoptical-ultraviolet data, and ground-based GASP-WEBT
optical observations, including polarization information, to study the
source variability and the overall spectral energy distribution during
the γ-ray flare. The γ-ray flaring data, compared with as
yet unpublished simultaneous optical data that will allow constraints on
the big blue bump disk luminosity, show very high Compton dominance
values of ∼100, with the ratio of γ-ray to optical emission
rising by a factor of three in a few hours. The multiwavelength behavior
of the source during the flare challenges one-zone leptonic theoretical
models. The new observations during the 2015 June flare are also
compared with already published data and nonsimultaneous historical 3C
279 archival data.
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Variability in Active Galactic Nuclei: Multifrecuency Studies
Active Galactic Nuclei (AGN) are characterized by a strong emission coming from a very compact region (only few pcs) at the galaxy center. Blazars form a class of AGN, characterized by high luminosity in a broad frequency range, from radiofrequencies to high energies (X-rays and γ -rays), as well as extreme variability and high polarization at
José Antonio
Acosta Pulido