Multiwavelength behaviour of the blazar 3C279: decade-long study from $\gamma$-ray to radio

Abstract

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 > 3 hours, implying general co-spatiality 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 VLBA 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 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 $\tau =1$ 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 $\sim 5$ GHz. These tendencies suggest different Doppler boosting of stratified radio-emitting zones in the jet.

arXiv comment21 pages, 18 figures, accepted for publication in MNRAS

References in corpus (73)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Correcting for the Effects of Interstellar Extinction
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• Are the Variations in Quasar Optical Flux Driven by Thermal Fluctuations?
• Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Jet Kinematics from Bimonthly Monitoring with the Very Long Baseline Array
• On Uncertainties in Cross-Correlation Lags and the Reality of Wavelength-Dependent Continuum Lags in Active Galactic Nuclei
• An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zw 1
• Blazars in the Fermi Era: The OVRO 40-m Telescope Monitoring Program
• Turbulent, Extreme Multi-Zone Model for Simulating Flux and Polarization Variability in Blazars
• Fast TeV variability in blazars: jets in a jet
• Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
• Multi-Epoch VLBA Observations of EGRET-Detected Quasars and BL Lac Objects: Superluminal Motion of Gamma-Ray Bright Blazars
• Constraining Emission Models of Luminous Blazar Sources
• Kinematics of Parsec-Scale Jets of Gamma-Ray Blazars at 43~GHz within the VLBA-BU-BLAZAR Program
• Gamma-ray Light Curves and Variability of Bright Fermi-Detected Blazars
• Is Quasar Optical Variability a Damped Random Walk?
• Minute-Timescale >100 MeV gamma-ray variability during the giant outburst of quasar 3C 279 observed by Fermi-LAT in 2015 June
• MOJAVE. XVII. Jet Kinematics and Parent Population Properties of Relativistically Beamed Radio-Loud Blazars
• Multiwavelength Observations of a Dramatic High Energy Flare in the Blazar 3C 279
• MOJAVE XIII. Parsec-Scale AGN Jet Kinematics Analysis Based on 19 years of VLBA Observations at 15 GHz
• Log-parabolic spectra and particle acceleration in blazars. III: SSC emission in the TeV band from Mkn 501
• Flaring Behavior of the Quasar 3C~454.3 across the Electromagnetic Spectrum
• Rapid Variability of Blazar 3C 279 during Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multi-wavelength Observations
• Blazar spectral variability as explained by a twisting inhomogeneous jet
• The structure and emission model of the relativistic jet in the quasar 3C 279 inferred from radio to high-energy gamma-ray observations in 2008-2010
• The unprecedented optical outburst of the quasar 3C 454.3. The WEBT campaign of 2004-2005
• The WEBT BL Lac Campaign 2000
• Correlated Multi-Waveband Variability in the Blazar 3C~279 from 1996 to 2007
• Multiwaveband Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Correlated Polarization Behavior
• Multi-Epoch VLBA Observations of EGRET-Detected Quasars and BL Lac Objects: Connection between Superluminal Ejections and Gamma-Ray Flares in Blazars
• Results of WEBT, VLBA and RXTE monitoring of 3C 279 during 2006-2007
• SBS 0846+513: a new gamma-ray emitting Narrow-Line Seyfert 1 galaxy
• The Outburst of the Blazar S5 0716+71 in 2011 October: Shock in a Helical Jet
• Multifrequency monitoring of the blazar 0716+714 during the GASP-WEBT-AGILE campaign of 2007
• Survey of Instantaneous 1-22 GHz Spectra of 550 Compact Extragalactic Objects with Declinations from -30deg to +43deg
• AN IMPROVED MEASURE OF QUASAR ORIENTATION
• A new activity phase of the blazar 3C 454.3. Multifrequency observations by the WEBT and XMM-Newton in 2007-2008
• Flare-like variability of the Mg IIλ2800Å emission line in the gamma-ray blazar 3C 454.3
• The Outburst of the Blazar AO 0235+164 in 2006 December: Shock-in-Jet Interpretation
• Emission from Hot Dust in the Infrared Spectra of Gamma-ray Bright Blazars
• The GASP-WEBT monitoring of 3C 454.3 during the 2008 optical-to-radio and gamma-ray outburst
• POLAMI: Polarimetric Monitoring of Active Galactic Nuclei at Millimetre Wavelengths. III. Characterisation of total flux density and polarisation variability of relativistic jets
• POLAMI: Polarimetric Monitoring of Active Galactic Nuclei at Millimetre Wavelengths. I. The program, calibration, and calibrators data products
• The WEBT Campaign on the Blazar 3C279 in 2006
• WEBT and XMM-Newton observations of 3C 454.3 during the post-outburst phase. Detection of the little and big blue bumps
• Kinematics of the Parsec-Scale Relativistic Jet in Quasar 3C 279: 1991 - 1997
• The First Simultaneous 3.5 and 1.3mm Polarimetric Survey of Active Galactic Nuclei in the Northern Sky
• Through The Ring Of Fire: $\gamma$-Ray Variability In Blazars By A Moving Plasmoid Passing A Local Source Of Seed Photons
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• XPOL - the correlation polarimeter at the IRAM 30m telescope
• Variability of the blazar 4C 38.41 (B3 1633+382) from GHz frequencies to GeV energies
• Exceptional outburst of the blazar CTA 102 in 2012: The GASP-WEBT campaign and its extension
• Multiwavelength Observations of 3C 66A during the WEBT campaign of 2003 - 2004
• POLAMI: Polarimetric Monitoring of Active Galactic Nuclei at Millimetre Wavelengths. II. Widespread circular polarisation
• A Consolidated Framework of the Color Variability in Blazars: Long-Term Optical/Near-Infrared Observations of 3C 279
• The nature of optical and near-infrared variability of BL Lacertae
• Multiwavelength behaviour of the blazar OJ 248 from radio to γ-rays
• Fine-scale structure of the quasar 3C 279 Measured with 1.3 mm very long baseline interferometry
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• Exploring the connection between parsec-scale jet activity and broadband outbursts in 3C 279
• RATAN-600 multi-frequency data for the BL Lac objects
• Multiwavelength Photometric and Spectropolarimetric Analysis of the FSRQ 3C 279
• Revealing the Nature of Blazar Radio Cores through Multi-Frequency Polarization Observations with the Korean VLBI Network
• Monitoring of GAmma-ray Bright AGN : The Multi-frequency Polarization of the Flaring Blazar 3C 279
• Optical Variability of TeV Blazars on long time-scales
• The SMARTS Multi-epoch Optical Spectroscopy Atlas (SAMOSA): Using Emission Line Variability to Probe the Location of the Blazar Gamma-emitting Region
• The Bright $\gamma$-ray Flare of 3C 279 in June 2015: AGILE Detection and Multifrequency Follow-up Observations
• Microlensing of Quasar UV Iron Emission
• Multi-Epoch Observations of the Redwing Excess in the Spectrum of 3C279
• X-ray, UV, and Radio Timing Observations of the Radio Galaxy 3C 120
• The Optical Properties of PKS 1222+216 During the Fermi Mission

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