Gamma-ray flares and broadband spectral study of PKS 0402-362
arXiv:2303.03039 · doi:10.1093/mnras/stad702
Abstract
We study the long-term behavior of the bright gamma-ray blazar PKS 0402-362. We collected approximately 13 years of Fermi-LAT data between Aug 2008 to Jan 2021 and identified three bright -ray activity epochs. The second was found to be the brightest epoch ever seen in this source. We observed most of the -ray flare peaks to be asymmetric in profile suggesting a slow cooling time of particles or the varying Doppler factor as the main cause of these flares. The -ray spectrum is fitted with PL and LP spectral models, and in both cases, the spectral index is very steep. The -ray spectrum does not extend beyond 10 GeV energy suggesting the emission is produced within the BLR. The absence of time lags between optical-IR and -ray suggest one zone emission model. Using the above information, we have modeled the broadband SED with a simple one-zone emission model using the publicly available code `GAMERA'. The particle distribution index is found to be the same as expected in diffusive shock acceleration suggesting it as the main mechanism of particle acceleration to very high energy up to 4 - 6 GeV. Throughout the various flux phases, we noticed that the optical emission is dominated by the thermal disk, suggesting it to be a good source to examine the disk-jet coupling. We postulate that the observed broadband flares could be linked with perturbation produced in the disk, which propagates to the jet and interacts with the standing shock. However, a more detailed examination is required.
arXiv commentAccepted for publication in The MNRAS
References in corpus (46)
- Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
- Unified Schemes for Radio-Loud Active Galactic Nuclei
- The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
- The Swift X-ray Telescope
- The Swift Ultra-Violet/Optical Telescope
- The 6dF Galaxy Survey: Final Redshift Release (DR3) and Southern Large-Scale Structures
- Studies in Astronomical Time Series Analysis. VI. Bayesian Block Representations
- On Uncertainties in Cross-Correlation Lags and the Reality of Wavelength-Dependent Continuum Lags in Active Galactic Nuclei
- Semi-analytic modeling of the EBL and consequences for extragalactic gamma-ray spectra
- Canonical high power blazars
- TeV Gamma Rays from BL Lac Objects due to Synchrotron Radiation of Extremely High Energy Protons
- Measuring the broadband power spectra of active galactic nuclei with RXTE
- Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies
- A Proton Synchrotron Blazar Model for Flaring in Markarian~501
- Internal shocks in the jets of radio-loud quasars
- Log-parabolic spectra and particle acceleration in the BL Lac object Mkn 421: spectral analysis of the complete BeppoSAX wide band X-ray data set
- Gamma-ray Light Curves and Variability of Bright Fermi-Detected Blazars
- SMARTS optical and infrared monitoring of 12 gamma-ray bright blazars
- Reconnection-driven plasmoids in blazars: fast flares on a slow envelope
- Spectral Properties of Bright Fermi-detected Blazars in the Gamma-ray Band
- An Updated Ultraviolet Calibration for the Swift/UVOT
- Time-correlation between the radio and gamma-ray activity in blazars and the production site of the gamma-ray emission
- Absorption of 10--200 Gev Gamma Rays by Radiation from BLR in Blazars
- Characterizing the Gamma-Ray Variability of the Brightest Flat Spectrum Radio Quasars Observed with the Fermi LAT
- Jet and accretion power in the most powerful Fermi blazars
- RoboPol: First season rotations of optical polarization plane in blazars
- Radiation fields of disk, BLR and torus in quasars and blazars: implications for gamma-ray absorption
- Gamma rays from interactions of stars with AGN jets
- Neutrino production through hadronic cascades in AGN accretion disks
- Geometry and inclination of the broad line region in blazars
- Which blazars are neutrino loud?
- Gamma-ray and neutrino flares produced by protons accelerated on an accretion disk surface in AGN
- Exceptional outburst of the blazar CTA 102 in 2012: The GASP-WEBT campaign and its extension
- Implications of Gamma-Ray Transparency Constraints in Blazars: Minimum Distances and Gamma-Ray Collimation
- Long term study of the light curve of PKS 1510-089 in GeV energies
- Fermi-Large Area Telescope observations of the brightest Gamma-ray flare ever detected from CTA 102
- Two-zone emission modeling of PKS 1510-089 during the high state of 2015
- Multi-frequency variability study of Ton 599 during high activity of 2017
- IceCube Sensitivity for Neutrino Flux from Fermi Blazars in Quiescent States
- Broadband variability and correlation study of 3C 279 during flare of 2017-2018
- Probing the Jets of Blazars Using the Temporal Symmetry of Their Multi-Wavelength Outbursts
- Factors Determining Variability Time in Active Galactic Nucleus Jets
- Multi-wavelength Analysis and Modeling of OJ 287 During 2017-2020
- Multi-Wavelength Polarimetry and Spectral Study of M87 Jet During 2002-2008
- TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources
- Gamma-Ray Flares in Long Term Light Curve of 3C 454.3