Gamma-ray Flux Distribution and Non-linear behavior of Four LAT Bright AGNs

Abstract

We present a statistical characterization of the $\gamma$-ray emission from the four \emph{Fermi}-LAT sources: FR I radio galaxy NGC 1275, BL Lac Mrk 421, FSRQs B2 1520+31 and PKS 1510-089 detected almost continuously over a time integration of 3-days between August 2008 - October 2015. The observed flux variation is large, spanning $\gtrsim 2$ orders of magnitude between the extremes except for Mrk~421. We compute the flux distributions and compare with Gaussian and lognormal ones. We find that the 3 blazars have distribution consistent with a lognormal, suggesting that the variability is of a non-linear, multiplicative nature. This is further supported by the computation of the flux-rms relation, which is observed to be linear for the 3 blazars. However, for NGC 1275, the distribution does not seem to be represented either by a lognormal or a Gaussian, while its flux-rms relation is still found to be linear. We also compute the power spectra, which suggest the presence of a break, but are consistent with typical scale-free power-law shot noise. The results are broadly consistent with the statistical properties of the magnetic reconnection powered minijets-in-a-jet model. We discuss other possible scenarios and implications of these observations on jet processes and connections with the central engine.

arXiv comment15 Pages, 5 Figures, 3 Tables, accepted in the ApJ

References in corpus (48)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• On characterising the variability properties of X-ray light curves from active galaxies
• Active Galactic Nuclei as scaled-up Galactic black holes
• Turbulent, Extreme Multi-Zone Model for Simulating Flux and Polarization Variability in Blazars
• Fast TeV variability in blazars: jets in a jet
• Non-linear X-ray variability in X-ray binaries and active galaxies
• The power of relativistic jets is larger than the luminosity of their accretion disks
• Combined Long and Short Timescale X-ray Variability of NGC4051 with RXTE and XMM-Newton
• The flux-dependent amplitude of broadband noise variability in X-ray binaries and active galaxies
• Accretion states and radio loudness in Active Galactic Nuclei: analogies with X-ray binaries
• MCG-6-30-15: Long Timescale X-Ray Variability, Black Hole Mass and AGN High States
• Fast TeV variability from misaligned minijets in the jet of M87
• Rapid variability in TeV blazars: the case of PKS 2155-304
• Global Energetics of Solar Flares: V. Energy Closure in Flares and Coronal Mass Ejections
• Innermost collimation structure of the M87 jet down to ~ten Schwarzschild radii
• A Magnetohydrodynamic Model for the Formation of Episodic Jets
• The two states of Sgr A* in the near-infrared: bright episodic flares on top of low-level continuous variability
• Timing Signatures of the Internal-Shock Model for Blazars
• VHE gamma-ray emission of PKS 2155-304: spectral and temporal variability
• Source-intrinsic near-infrared properties of Sgr A*: Total intensity measurements
• Accretion-induced variability links young stellar objects, white dwarfs, and black holes
• Black-hole jets without large-scale net magnetic flux
• Stochastic Modeling of the Fermi/LAT Gamma-ray Blazar Variability
• The Universal Nature of Accretion-induced Variability: The RMS-Flux Relation in an Accreting White Dwarf
• Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares
• Spatial growth of current-driven instability in relativistic rotating jets and the search for magnetic reconnection
• The role of fast magnetic reconnection on the radio and gamma-ray emission from the nuclear regions of microquasars and low luminosity AGNs
• The minijets-in-a-jet statistical model and the RMS-flux correlation
• Crab Nebula gamma-ray flares as relativistic reconnection minijets
• Lognormal variability in BL Lacertae
• Transient jet formation and state transitions from large-scale magnetic reconnection in black hole accretion discs
• New constraints on the structure and dynamics of black hole jets
• The flux-dependent rms variability of X-ray binaries in the optical
• Long-term study of Mkn 421 with the HAGAR Array of Telescopes
• A power-law break in the near-infrared power spectrum of the Galactic center black hole
• Evidence for two Lognormal States in Multi-wavelength Flux Variation of FSRQ PKS 1510-089
• On the role of fast magnetic reconnection in accreting black hole sources
• A magnetic reconnection model for explaining the multi-wavelength emission of the microquasars Cyg X-1 and Cyg X-3
• Time series analysis of gamma-ray blazars and implications for the central black-hole mass
• The rms-flux relation in accreting white dwarfs: another nova-like variable and the first dwarf nova
• The Cosmic Battery in Astrophysical Accretion Disks
• A formal method for identifying distinct states of variability in time-varying sources: SgrA* as an example
• Brightest Fermi-LAT Flares of PKS 1222+216: Implications on Emission and Acceleration Processes
• On the spectral curvature of VHE blazar 1ES\,1011+496: Effect of spatial particle diffusion
• Multi-wavelength Temporal Variability of the Blazar 3C 454.3 during 2014 Activity Phase
• Log-Normal Distributions in Cygnus X-1: Possible Physical Link with Gamma-Ray Bursts and Blazars
• Similar phenomena at different scales: Black Holes, the Sun, Gamma-ray Bursts, Supernovae, Galaxies and Galaxy Clusters

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• Multiwavelength monitoring of NGC 1275 over a decade: Evidence of a shift in synchrotron peak frequency and long-term multi-band flux increase
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