The Bright γ-ray Flare of 3C 279 in 2015 June: AGILE Detection and Multifrequency Follow-up Observations
Journal
Date Issued
2018
Author(s)
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Puccetti, S.
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Donnarumma, I.
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Acosta-Pulido, J. A.
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Bachev, R.
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Benítez, E.
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Borman, G. A.
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Carosati, D.
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Chen, W. P.
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Ehgamberdiev, Sh. A.
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Goded, A.
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Grishina, T. S.
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Hiriart, D.
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Hsiao, H. Y.
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Jorstad, S. G.
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Kimeridze, G. N.
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Kopatskaya, E. N.
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Kurtanidze, O. M.
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Kurtanidze, S. O.
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Larionov, V. M.
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Larionova, L. V.
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Marscher, A. P.
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Mirzaqulov, D. O.
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Morozova, D. A.
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Nilsson, K.
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Samal, M. R.
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Sigua, L. A.
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Spassov, B.
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Strigachev, A.
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Takalo, L. O.
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Cattaneo, P.
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Colafrancesco, S.
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Giommi, P.
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Longo, F.
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Morselli, A.
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Paoletti, F.
Abstract
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.
Volume
856
Issue
2
Start page
99
Issn Identifier
0004-637X
Ads BibCode
2018ApJ...856...99P
Rights
open.access
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