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

We report the results of decade-long (2008-2018) gamma-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 gamma-ray light curves correlate well, with no delay greater than or similar to 3 h, implying general cospatiality of the emission regions. The gamma-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 gamma-ray variability on very short time-scales, The Mg II emission line flux in the 'blue' and 'red' wings correlates with the optical synchrotron conlinuum 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 tau = 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 similar to 5 GHz, These tendencies suggest. different Doppler boosting of stratified radio-emitting zones in the jet.

Original languageEnglish
Pages (from-to)3829-3848
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume492
Issue number3
DOIs
StatePublished - 1 Mar 2020

    Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

    Research areas

  • methods: observational, techniques: photometric, techniques: polarimetric, techniques: spectroscopic, galaxies: active, quasars: individual: 3C 279, BL LACERTAE OBJECTS, WEBT CAMPAIGN, HIGH-FREQUENCIES, EGRET-DETECTED QUASARS, MILLIMETER WAVELENGTHS, ACTIVE GALACTIC NUCLEI, LINE ARRAY OBSERVATIONS, POLARIMETRIC OBSERVATIONS, SUPERLUMINAL MOTION, XMM-NEWTON, Galaxies, Spectroscopic, Photometric, Quasars, 3C 279, Observational, Techniques, Polarimetric, Active, Individual, Methods

ID: 51235908