On the spectral curvature of VHE blazar 1ES\,1011+496: Effect of spatial particle diffusion

Abstract

A detailed multi-epoch study of the broadband spectral behaviour of the very high energy (VHE) source, 1ES\,1011+496, provides us with valuable information regarding the underlying particle distribution. Simultaneous observations of the source at optical/ UV/ X-ray/ $\gamma$-ray during three different epochs, as obtained from Swift-UVOT/ Swift-XRT/ Fermi-LAT, are supplemented with the information available from the VHE telescope array, HAGAR. The longterm flux variability at the Fermi-LAT energies is clearly found to be lognormal. It is seen that the broadband spectral energy distribution (SED) of 1ES\,1011+496 can be successfully reproduced by synchrotron and synchrotron self Compton emission models. Notably, the observed curvature in the photon spectrum at X-ray energies demands a smooth transition of the underlying particle distribution from a simple power law to a power law with an exponential cutoff or a smooth broken power law distribution, which may possibly arise when the escape of the particles from the main emission region is energy dependent. Specifically, if the particle escape rate is related to its energy as $E^{0.5}$ then the observed photon spectrum is consistent with the ones observed during the various epochs.

arXiv comment29 pages, 8 figures; Accepted in ApJ

References in corpus (38)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Unified Schemes for Radio-Loud Active Galactic Nuclei
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• The Swift X-ray Telescope
• On characterising the variability properties of X-ray light curves from active galaxies
• The Spectral Energy Distribution of Fermi bright blazars
• The MAXI Mission on the ISS: Science and Instruments for Monitoring All Sky X-Ray Images
• The Connection between X-ray- and Radio-Selected BL Lacertae Objects
• BL Lac Objects in the Synchrotron Proton Blazar Model
• Blazars in the Fermi Era: The OVRO 40-m Telescope Monitoring Program
• Constraints on the Physical Parameters of TeV Blazars
• A Proton Synchrotron Blazar Model for Flaring in Markarian~501
• Comptonization of Infrared Radiation from Hot Dust by Relativistic Jets in Quasars
• Multiwavelength Observations of Strong Flares From the TeV-Blazar 1ES 1959+650
• 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
• The flux-dependent amplitude of broadband noise variability in X-ray binaries and active galaxies
• Modeling the Emission Processes in Blazars
• Analytical solutions for energy spectra of electrons accelerated by nonrelativistic shock-waves in shell type supernova remnants
• Reconnection-driven plasmoids in blazars: fast flares on a slow envelope
• Relativistic Shocks: Particle Acceleration and Magnetization
• Rapid variability in the synchrotron self Compton model for blazars
• TeV candidate BL Lac objects
• A Lower-Limit Flux for the Extragalactic Background Light
• Host galaxy subtraction of TeV candidate BL Lacertae objects
• Discovery of Very High Energy gamma-rays from 1ES 1011+496 at z=0.212
• The Gamma-Ray Blazar Content of the Northern Sky
• The Universal Nature of Accretion-induced Variability: The RMS-Flux Relation in an Accreting White Dwarf
• Lognormal variability in BL Lacertae
• MAGIC observations of the February 2014 flare of 1ES 1011+496 and ensuing constraint of the EBL density
• Multiwavelength study of TeV Blazar Mrk421 during giant flare
• Modelling the VHE flare of 3C 279 using one zone leptonic model
• Long-term study of Mkn 421 with the HAGAR Array of Telescopes
• Evidence for two Lognormal States in Multi-wavelength Flux Variation of FSRQ PKS 1510-089
• Investigating the peculiar emission from the new VHE gamma-ray source H1722+119
• X-ray variability of AGNs in the soft and the hard X-ray bands
• Gamma-ray Flare of PKS 1222+216 in 2010: Effect of Jet Dynamics at the Recollimation Zone
• Insights into the emission of the blazar 1ES 1011+496 through unprecedented broadband observations during 2011 and 2012
• Optical Spectral Variability of the Very-High-Energy Gamma-Ray Blazar 1ES 1011+496

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