Discerning the $\gamma$-ray emitting region in the flat spectrum radio quasars

Abstract

A model-dependent method is proposed to determine the location of the $\gamma$-ray emitting region for a given flat spectrum radio quasar (FSRQ). In the model, the extra-relativistic electrons are injected at the base of the jet and non-thermal photons are produced by both synchrotron radiation and inverse-Comtpon (IC) scattering in the energy dissipation region. The target photons dominating inverse-Comtpon scattering originate from both synchrotron photons and external ambient photon fields, and the energy density of external radiation field is a function of the distance between the position of dissipation region and a central super-massive black hole, and their spectra are seen in the comoving frame. Moreover, the energy dissipation region could be determined by the model parameter through reproducing the $\gamma$-ray spectra. Such a model is applied to reproduce the quasi-simultaneous multi-wavelength observed data for 36 FSRQs. In order to define the width of the broad-line region shell and dusty molecular torus shell, a simple numerical constraint is used to determine the outer boundary of the broad-line region and dusty molecular torus. Our results show that 1) the $\gamma$-ray emitting regions are located at the range from 0.1 pc to 10 pc; 2) the $\gamma$-ray emitting regions are located outside the broad-line regions and within the dusty molecular tori; and 3) the $\gamma$-ray emitting region are located closer to the dusty molecular torus ranges than the broad-line regions. Therefore, it may concluded that a direct evidence for the \emph{far site} scenario could be obtained on the basis of the model results.

11 pages, 42 figures, accepted for publication in ApJS

References in corpus (19)

• AGN Dusty Tori: I. Handling of Clumpy Media
• Fast TeV variability in blazars: jets in a jet
• Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
• The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements
• MAGIC discovery of VHE Emission from the FSRQ PKS 1222+21
• Modeling the Emission Processes in Blazars
• Synchrotron Self-Compton Analysis of TeV X-ray Selected BL Lacertae Objects
• The blazar sequence: a new perspective
• GeV breaks in blazars as a result of gamma-ray absorption within the broad-line region
• Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars
• Results of WEBT, VLBA and RXTE monitoring of 3C 279 during 2006-2007
• The spectrum of the Broad Line Region and the high-energy emission of powerful blazars
• Constraints on minimum electron Lorentz factor and matter content of jets for a sample of bright Fermi blazars
• Synchrotron and inverse-Compton emission from blazar jets I: a uniform conical jet model
• Bulk Comptonization spectra in blazars
• Locating the gamma-ray emission site in Fermi/LAT blazars from correlation analysis between 37 GHz radio and gamma-ray light curves
• Absorption of 10 Gev--1 Tev Gamma Rays by Radiation from Broad-Line Region in 3C 279
• A test on external Compton models for $\gamma$-ray active galactic nuclei
• Modelling the multi-wavelength emission of flat spectrum radio quasar 3C 279

Cited by in corpus (5)

• Evaluating the optical classification of Fermi BCUs using machine learning
• The relativistic jet of the gamma-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
• Particle acceleration and synchrotron self-Compton emission in blazar jets I : an application to the quiescent emission
• Constraints on the location of $\gamma$-ray emitting region for a sample of blazars with radio core-shift measurements
• Constraints on the location of the gamma-ray emission region for the gamma-ray-loud radio source GB 1310+487