Details

Autor(en) / Beteiligte

• Larionov, V M
• Jorstad, S G
• Marscher, A P
• Villata, M
• Raiteri, C M
• Smith, P S
• Agudo, I
• Savchenko, S S
• Morozova, D A
• Acosta-Pulido, J A
• Aller, M F
• Aller, H D
• Andreeva, T S
• Arkharov, A A
• Bachev, R
• Bonnoli, G
• Borman, G A
• Bozhilov, V
• Calcidese, P
• Carnerero, M I
• Carosati, D
• Casadio, C
• Chen, W-P
• Damljanovic, G
• Dementyev, A V
• Di Paola, A
• Frasca, A
• Fuentes, A
• Gómez, J L
• Gónzalez-Morales, P
• Giunta, A
• Grishina, T S
• Gurwell, M A
• Hagen-Thorn, V A
• Hovatta, T
• Ibryamov, S
• Joshi, M
• Kiehlmann, S
• Kim, J-Y
• Kimeridze, G N
• Kopatskaya, E N
• Kovalev, Yu A
• Kovalev, Y Y
• Kurtanidze, O M
• Kurtanidze, S O
• Lähteenmäki, A
• Lázaro, C
• Larionova, L V
• Larionova, E G
• Leto, G
• Marchini, A
• Matsumoto, K
• Mihov, B
• Minev, M
• Mingaliev, M G
• Mirzaqulov, D
• Muñoz Dimitrova, R V
• Myserlis, I
• Nikiforova, A A
• Nikolashvili, M G
• Nizhelsky, N A
• Ovcharov, E
• Pressburger, L D
• Rakhimov, I A
• Righini, S
• Rizzi, N
• Sadakane, K
• Sadun, A C
• Samal, M R
• Sanchez, R Z
• Semkov, E
• Sergeev, S G
• Sigua, L A
• Slavcheva-Mihova, L
• Sola, P
• Sotnikova, Yu V
• Strigachev, A
• Thum, C
• Traianou, E
• Troitskaya, Yu V
• Troitsky, I S
• Tsybulev, P G
• Vasilyev, A A
• Vince, O
• Weaver, Z R
• Williamson, K E
• Zhekanis, G V

Titel

Multiwavelength behaviour of the blazar 3C 279: decade-long study from γ-ray to radio

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2020-03, Vol.492 (3), p.3829-3848

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2020

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• ABSTRACT We report the results of decade-long (2008–2018) γ-ray to 1 GHz radio monitoring of the blazar 3C 279, including GASP/WEBT, Fermi and Swift data, as well as polarimetric and spectroscopic data. The X-ray and γ-ray light curves correlate well, with no delay $\gtrsim 3$ h, implying general cospatiality of the emission regions. The γ-ray–optical flux–flux relation changes with activity state, ranging from a linear to a more complex dependence. The behaviour of the Stokes parameters at optical and radio wavelengths, including 43 GHz Very Long Baseline Array images, supports either a predominantly helical magnetic field or motion of the radiating plasma along a spiral path. Apparent speeds of emission knots range from 10 to 37c, with the highest values requiring bulk Lorentz factors close to those needed to explain γ-ray variability on very short time-scales. The Mg ii emission line flux in the ‘blue’ and ‘red’ wings correlates with the optical synchrotron continuum flux density, possibly providing a variable source of seed photons for inverse Compton scattering. In the radio bands, we find progressive delays of the most prominent light-curve maxima with decreasing frequency, as expected from the frequency dependence of the τ = 1 surface of synchrotron self-absorption. The global maximum in the 86 GHz light curve becomes less prominent at lower frequencies, while a local maximum, appearing in 2014, strengthens toward decreasing frequencies, becoming pronounced at ∼5 GHz. These tendencies suggest different Doppler boosting of stratified radio-emitting zones in the jet.