Formation of very hard electron and gamma-ray spectra of flat spectrum radio quasar in fast-cooling regime

Abstract

In external Compton scenario, we investigate the formation of the very hard electron spectrum in the fast-cooling regime, using a time-dependent emission model. It is shown that a very hard electron distribution $N'_{\rm e}(\gp)\propto\gp^{-p}$ with the spectral index $p\sim 1.3$ is formed below the minimum energy of injection electron when inverse Compton scattering takes place in the Klein-Nishina regime, i.e., inverse Compton scattering of relativistic electrons on broad-line region radiation in flat spectrum radio quasars. This produces a very hard gamma-ray spectrum, and can reasonably explain the very hard \emph{Fermi}-LAT spectrum of the flat spectrum radio quasar 3C 279 during the extreme gamma-ray flare in 2013 December.

Accepted by MNRAS

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Cited by in corpus (11)

• Low-energy Spectra of Gamma-ray Bursts from Cooling Electrons
• Multiwavelength Variability Signatures of Relativistic Shocks in Blazar Jets
• Exploring the origin of multiwavelength activities of high-redshift FSRQ PKS 1502+106 during 2014-2018
• The Synchrotron Polarization in Decaying Magnetic Field in Gamma-Ray Bursts
• Testing one-zone synchrotron-self-Compton models with spectral energy distributions of Mrk 421
• A Method for Locating High Energy Dissipation Region in Blazar
• Similarity of Jet Radiation between Flat Spectrum Radio Quasars and GeV Narrow-Line Seyfert 1 Galaxies: A Universal $\delta$-$L_{\mathrm{c}}$ Correlation
• Inverse Compton Scattering Spectra of Gamma-Ray Burst Prompt Emission
• On the Injection of Relativistic Electrons in the Jet of 3C 279
• Using the Markov Chain Monte Carlo method to study the physical properties GeV-TeV BL Lac objects
• A Shock-in-Jet Synchrotron Mirror Model for Blazars