The effect of the broad-line region with geometrical structures on gamma-ray absorption in blazars

Abstract

The broad-line region (BLR) is an important component of blazars, especially for the flat spectrum radio quasars (FSRQs). The soft photons arising from the BLR will substantially affect the transparency of the gamma-ray photons produced in the relativistic jet. In the paper, we study the effect of the geometrical structure of the BLR on the absorption of gamma-rays. We find that the gamma-ray optical depth strongly depends on the geometrical structure of the BLR. For a "flat" geometry of the BLR, the gamma-ray photons with specified energies could escape transparently even their emission region locates inside the cavity of the BLR.

16 pages, 7 figures, accepted by PASJ

References in corpus (12)

• The Spectral Energy Distribution of Fermi bright blazars
• The transition between BL Lac objects and Flat Spectrum Radio Quasars
• 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
• The spectrum of the Broad Line Region and the high-energy emission of powerful blazars
• Are the black hole masses in Narrow Line Seyfert 1 galaxies actually small?
• Geometry and inclination of the broad line region in blazars
• Bulk Comptonization spectra in blazars
• Intrinsic absorption in 3C 279 at GeV-TeV energies and consequences for estimates of the EBL
• The BH mass of nearby QSOs: a comparison of the bulge luminosity and virial methods
• Variation of the gamma-gamma opacity by the He II Lyman continuum constrains the location of the gamma-ray emission region in the blazar 3C 454.3

Cited by in corpus (9)

• Leptonic and Hadronic Radiative Processes in Supermassive-Black-Hole Jets
• Explosive events in active region observed by IRIS and SST/CRISP
• Gamma-ray opacity of the anisotropic stratified broad-line regions in blazars
• The mystery of spectral breaks: Lyman continuum absorption by photon-photon pair production in the Fermi GeV spectra of bright blazars
• Properties of the narrow line Seyfert 1 galaxies revisited
• Modeling the spectral-energy-distribution of 3C 454.3 in a "flat" broad-line-region scenario
• Imprint of "Local Opacity" Effect in Gamma-Ray Spectrum of Blazar Jet
• Location of gamma-ray flaring region in quasar 4C +21.35
• Revisiting Correlations Between Broad-Line and Jet Emission Variations for AGNs: 3C 120 and 3C 273