aalto1 untyped-item.component.html
Multiwavelength behaviour of the blazar 3C 279: decade-long study from γ-ray to radio
Loading...
Files
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.
Date
Major/Subject
Mcode
Degree programme
Language
en
Pages
20
Series
Monthly Notices of the Royal Astronomical Society, Volume 492, issue 3, pp. 3829-3848
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 ≳ 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 amore 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 MgII 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.
Description
Keywords
methods: observational, techniques: photometric, techniques: polarimetric, techniques: spectroscopic, galaxies: active, quasars: individual: 3C 279, ACTIVE GALACTIC NUCLEI, LINE ARRAY OBSERVATIONS, EGRET-DETECTED QUASARS, BL LACERTAE OBJECTS, WEBT CAMPAIGN, POLARIMETRIC OBSERVATIONS, MILLIMETER WAVELENGTHS, SUPERLUMINAL MOTION, HIGH-FREQUENCIES, XMM-NEWTON
Other note
Citation
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, Carosati, D, Casadio, C, Chen, W-P, Damljanovic, G, Dementyev, A, Di Paola, A, Frasca, A, Fuentes, A, Gomez, J L, Gonzalez-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, Y A, Kovalev, Y, Kurtanidze, O M, Kurtanidze, S O, Lahteenmaki, A, Lazaro, C, Larionova, L, Larionova, E G, Leto, G, Marchini, A, Matsumoto, K, Mihov, B, Minev, M, Mingaliev, M G, Mirzaqulov, D, Dimitrova, R V M, 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, Y, Strigachev, A, Thum, C, Traianou, E, Troitskaya, Y, Troitsky, I S, Tsybulev, P G, Vasilyev, A A, Vince, O, Weaver, Z R, Williamson, K E & Zhekanis, G 2020, 'Multiwavelength behaviour of the blazar 3C 279: decade-long study from γ-ray to radio', Monthly Notices of the Royal Astronomical Society, vol. 492, no. 3, pp. 3829-3848. https://doi.org/10.1093/mnras/staa082