The structure and emission model of the relativistic jet in the quasar 3C279 inferred from radio to high-energy γ-ray observations in 2008-2010
Journal
Date Issued
2012
Author(s)
Hayashida, M.
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Madejski, G.M.
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Nalewajko, K.
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Sikora, M.
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Wehrle, A.E.
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Ogle, P.
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Collmar, W.
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Larsson, S.
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Fukazawa, Y.
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Itoh, R.
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Chiang, J.
•
Stawarz, Ł.
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Blandford, R.D.
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Richards, J.L.
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Max-Moerbeck, W.
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Readhead, A.
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Buehler, R.
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Cavazzuti, E.
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Ciprini, S.
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Gehrels, N.
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Reimer, A.
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Szostek, A.
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Tanaka, T.
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Tosti, G.
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Uchiyama, Y.
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Kawabata, K.S.
•
Kino, M.
•
Sakimoto, K.
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Sasada, M.
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Sato, S.
•
Uemura, M.
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Yamanaka, M.
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Greiner, J.
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Kruehler, T.
•
•
MacQuart, J.P.
•
Bock, D.C.-J.
•
•
•
Agudo, I.
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Aller, H.D.
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Aller, M.F.
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Arkharov, A.A.
•
Bach, U.
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Benítez, E.
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Berdyugin, A.
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Blinov, D.A.
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Blumenthal, K.
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Böttcher, M.
•
•
Carosati, D.
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Chen, W.P.
•
•
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Efimova, N.V.
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Forné, E.
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Gómez, J.L.
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Gurwell, M.A.
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Heidt, J.
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Hiriart, D.
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Jordan, B.
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Jorstad, S.G.
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Joshi, M.
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Kimeridze, G.
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Konstantinova, T.S.
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Kopatskaya, E.N.
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Koptelova, E.
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Kurtanidze, O.M.
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Lähteenmäki, A.
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Lamerato, A.
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Larionov, V.M.
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Larionova, E.G.
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Larionova, L.V.
•
•
Lindfors, E.
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Marscher, A.P.
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McHardy, I.M.
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Molina, S.N.
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Morozova, D.A.
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Nikolashvili, M.G.
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Nilsson, K.
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Reinthal, R.
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Roustazadeh, P.
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Sakamoto, T.
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Sigua, L.A.
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Sillanpää, A.
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Takalo, L.
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Tammi, J.
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Taylor, B.
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Tornikoski, M.
•
•
Troitsky, I.S.
•
Abstract
We present time-resolved broadband observations of the quasar 3C279 obtained from multi-wavelength campaigns conducted during the first two years of the Fermi Gamma-ray Space Telescope mission. While investigating the previously reported γ-ray/optical flare accompanied by a change in optical polarization, we found that the optical emission appears to be delayed with respect to the γ-ray emission by about 10days. X-ray observations reveal a pair of "isolated" flares separated by 90 days, with only weak γ-ray/optical counterparts. The spectral structure measured by Spitzer reveals a synchrotron component peaking in the mid-infrared band with a sharp break at the far-infrared band during the γ-ray flare, while the peak appears in the millimeter (mm)/submillimeter (sub-mm) band in the low state. Selected spectral energy distributions are fitted with leptonic models including Comptonization of external radiation produced in a dusty torus or the broad-line region. Adopting the interpretation of the polarization swing involving propagation of the emitting region along a curved trajectory, we can explain the evolution of the broadband spectra during the γ-ray flaring event by a shift of its location from 1pc to 4pc from the central black hole. On the other hand, if the γ-ray flare is generated instead at sub-pc distance from the central black hole, the far-infrared break can be explained by synchrotron self-absorption. We also model the low spectral state, dominated by the mm/sub-mm peaking synchrotron component, and suggest that the corresponding inverse-Compton component explains the steady X-ray emission. © 2012. The American Astronomical Society. All rights reserved..
Volume
754
Issue
2
Start page
114
Issn Identifier
0004-637X
Ads BibCode
2012ApJ...754..114H
Rights
open.access
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