Modeling the time variable spectral energy distribution of the blazar CTA 102 from 2008 to 2022

Abstract

We present long-term multiwavelength observations of blazar CTA 102 ($z=1.037$). Detailed temporal and spectral analyses of $\gamma$-ray, X-ray and UV/optical data observed by {\it Fermi}-LAT, Swift XRT, NuSTAR and Swift-UVOT over a period of 14 years, between August 2008 and March 2022, was performed. We found strong variability of source emission in all the considered bands, especially in the $\gamma$-ray band it exhibited extreme outbursts when the flux crossed the level of $10^{-5}\mathrm{photon}\mathrm{c}{\mathrm{m}}^{-2}{\mathrm{s}}^{-1}$. Using the Bayesian Blocks algorithm, we split the adaptively binned $\gamma$-ray light curve into 347 intervals of quiescent and flaring episodes and for each period built corresponding multiwavelength spectral energy distributions (SEDs), using the available data. Among the considered SEDs, 117 high-quality (quasi) contemporaneous SEDs which have sufficient multiwavelength data, were modeled using JetSeT framework within a one-zone leptonic synchrotron and inverse Compton emission scenario assuming the emitting region is within the broad-line-region and considering internal and external seed photons for the inverse Compton up-scattering. As a result of modeling, the characteristics of the relativistic electron distribution in the jet as well as jet properties are retrieved and their variation in time is investigated. The applied model can adequately explain the assembled SEDs and the modelling shows that the data in the bright flaring periods can be reproduced for high Doppler boosting and magnetic field. The obtained results are discussed in the context of particle cooling in the emitting region.

Accepted for publication in MNRAS; doi.org/10.1093/mnras/stac2875

References in corpus (26)

• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Active Galactic Nuclei: what's in a name?
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• Particle acceleration in relativistic collisionless shocks: Fermi process at last?
• Fast TeV variability in blazars: jets in a jet
• Bethe-Heitler emission in BL Lacs: filling the gap between X-rays and $\gamma$-rays
• Probing Acceleration and Turbulence at Relativistic Shocks in Blazar Jets
• X-ray spectra, light-curves and SEDs of blazars frequently observed by Swift
• Time-dependent lepto-hadronic modeling of the emission from blazar jets with SOPRANO: the case of TXS 0506+056, 3HSP J095507.9+355101 and 3C 279
• 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
• Rapid Gamma-ray variability of NGC 1275
• Cloud ablation by a relativistic jet and the extended flare in CTA 102 in 2016 and 2017
• A thirteen-year-long broadband view of BL Lac
• The first hard X-ray spectral catalogue of Blazars observed by NuSTAR
• Investigating the multiwavelength behaviour of the flat spectrum radio quasar CTA 102 during 2013-2017
• Multiwavelength Study of High-Redshift Blazars
• Comparing 3C 120 jet emission at small and large scales
• Locating the gamma-ray emission region in the brightest Fermi-LAT Flat Spectrum Radio Quasars
• Correlation between optical and $\gamma$-ray flux variations in bright flat spectrum radio quasars
• High Energy Gamma-Ray Emission From PKS 1441+25
• Modeling the Broadband Emission of 3C 454.3
• The Origin of the Multiwavelength Emission of PKS 0502+049
• Multiwavelength Study of the Quiescent States of Six Brightest Flat Spectrum Radio Quasars detected by Fermi-LAT
• The strange case of the transient HBL blazar 4FGL J1544.3-0649
• Investigation of the Gamma-ray Spectrum of CTA 102 During the Exceptional Flaring State in 2016-2017
• Magnetic Field Strengths of the Synchrotron Self-Absorption Region in the Jet of CTA 102 During Radio Flares

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• Gamma-ray flares from the jet of the blazar CTA 102 in 2016-2018
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