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Title: The structure and emission model of the relativistic jet in the quasar 3C 279 inferred from radio to high-energy γ-ray observations in 2008-2010

Journal Article · · The Astrophysical Journal

Here, we present time-resolved broadband observations of the quasar 3C 279 obtained from multi-wavelength campaigns conducted during the first two years of the Fermi Gamma-ray Space Telescope mission. And, 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 10 days. 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. Furthermore, by 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 ~1 pc to ~4 pc 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.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi LAT Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356717
Journal Information:
The Astrophysical Journal, Vol. 754, Issue 2; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 126 works
Citation information provided by
Web of Science

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Gamma-Ray Polarimetry: A New Window for the Nonthermal Universe journal September 2019
Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC journal January 2020
Multiwavelength behaviour of the blazar 3C 279: decade-long study from γ-ray to radio journal January 2020
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A two-zone model for blazar emission: implications for TXS 0506+056 and the neutrino event IceCube-170922A text January 2019
Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE γ -ray observations with H.E.S.S. text January 2019
Minute-Timescale > 100 MeV $\gamma$-Ray Variability During the Giant Outburst of Quasar 3C 279 Observed by FERMI-LAT in 2015 June text January 2016
Testing emission models on the extreme blazar 2WHSP J073326.7+515354 detected at very high energies with the MAGIC telescopes text January 2019
New Hard-TeV Extreme Blazars Detected with the MAGIC Telescopes text January 2020
Compton Dominance and the Blazar Sequence text January 2012
Constraining the Location of Gamma-Ray Flares in Luminous Blazars text January 2014
Resolving the High Energy Universe with Strong Gravitational Lensing: The Case of PKS 1830-211 text January 2015
The Most Intensive Gamma-Ray Flare of Quasar 3C 279 with the Second-Order Fermi Acceleration text January 2015
A Steady-State Spectral Model For Electron Acceleration And Cooling In Blazar Jets: Application To 3C 279 text January 2017
Multiwavelength Photometric and Spectropolarimetric Analysis of the FSRQ 3C 279 text January 2018
Multi-frequency variability study of Ton 599 during high activity of 2017 text January 2018
The extended flare in CTA 102 in 2016 and 2017 within a hadronic model through cloud ablation by the relativistic jet text January 2018
Gamma Ray polarimetry; a new window for the non-thermal Universe text January 2019
Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE gamma-ray observations with H.E.S.S text January 2019
Electron Acceleration In Blazars: Application to the 3C 279 Flare on 2013 December 20 text January 2019
Physical Inference from the gamma-ray, X-Ray and Optical Time Variability of a Large Sample of Fermi Blazars text January 2019
Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-2017 text January 2019
New hard-TeV extreme blazars detected with the MAGIC telescopes text January 2019
Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC text January 2020