The redshift-dependence of gamma-ray absorption in the environments of strong-line AGN
arXiv:0705.1534 · doi:10.1086/519766
Abstract
The case of gamma-ray absorption due to photon-photon pair production of jet photons in the external photon environment like accretion disk and broad-line region radiation field of gamma-ray loud active galactic nuclei (AGN) that exhibit strong emission lines is considered. I demonstrate that this ''local opacity'', if detected, will almost unavoidably be redshift-dependent in the sub-TeV range. This introduces non-negligible biases, and complicates approaches for studying the evolution of the extragalactic background light with contemporary GeV instruments like e.g. the Gamma-ray Large Area Space Telescope (GLAST), etc., where the gamma-ray horizon is probed by means of statistical analysis of absorption features (e.g. Fazio-Stecker relation, etc.) in AGN spectra at various redshifts. It particularly applies to strong-line quasars where external photon fields are potentially involved in gamma-ray production.
19 pages, 5 figures; accepted for publication in ApJ
References in corpus (5)
- Cosmic Evolution of Mass Accretion Rate and Metalicity in Active Galactic Nuclei
- Statistics of Cosmological Black Hole Jet Sources: Blazar Predictions for GLAST
- The effect of stellar feedback and quasar winds on the AGN population
- Corrected Table for the Parametric Coefficients for the Optical Depth of the Universe to Gamma-rays at Various Redshifts
- Optical spectroscopy of BL Lacertae objects. Broad lines, companion galaxies and redshift lower limits
Cited by in corpus (22)
- MAGIC discovery of VHE Emission from the FSRQ PKS 1222+21
- Synchrotron Self-Compton Analysis of TeV X-ray Selected BL Lacertae Objects
- The Imprint of The Extragalactic Background Light in the Gamma-Ray Spectra of Blazars
- 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
- Constraining the Location of Gamma-Ray Flares in Luminous Blazars
- Intrinsic absorption in 3C 279 at GeV-TeV energies and consequences for estimates of the EBL
- Absorption of 10 Gev--1 Tev Gamma Rays by Radiation from Broad-Line Region in 3C 279
- Gamma-ray opacity of the anisotropic stratified broad-line regions in blazars
- First stars and the extragalactic background light: How recent gamma-ray observations constrain the early universe
- VHE Gamma-Ray Induced Pair Cascades in the Radiation Fields of Dust Tori of AGN: Application to Cen A
- H.E.S.S. detection of very-high-energy gamma-ray emission from the quasar PKS 0736+017
- The vanishing of the primary emission region in PKS 1510-089
- Studies of active galactic nuclei with CTA
- MAGIC upper limits to the VHE gamma-ray flux of 3C454.3 in high emission state
- Investigation of the Gamma-ray Spectrum of CTA 102 During the Exceptional Flaring State in 2016-2017
- How gravitational lensing helps gamma-ray photons avoid absorption
- Prospects for gamma-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array II. Gamma-gamma absorption in the broad-line region radiation fields
- Pair Cascades at the Edge of the Broad-Line Region Shaping the Gamma-Ray Spectrum of 3C 279
- Blazars and Optical Depth in a non-linear, time-dependent injection and cooling scenario
- Ultra High Energy Neutrino Event KM3-230213A as a Signal of Electroweak Vacuum Turbulence in Merging Black Hole Binaries