Electron-Photon Cascading of Very High-Energy Gamma-Rays in the Infrared Background

Details Electron-Photon Cascading of Very High-Energy Gamma-Rays in the Infrared Background Electron-Photon Cascading of Very High-Energy Gamma-Rays in the Infrared Background

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.264..191p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 264, NO. 1/SEP1, P. 191, 1993

Astronomy and Astrophysics

Astronomy

57

Radiation Mechanisms: Miscellaneous - Radiative Transfer - Galaxies: Active - Diffuse Radiation - Gamma-Rays: Theory

Scientific paper

Soon after the detection by the Compton Gamma Ray Observatory of γ-rays above 100 MeV from the optically violent variable 3C 279 at a redshift of z=0.54, Stecker et al. pointed out that TeV γ-rays from large-redshift sources would be attenuated by photon-photon interactions in the intergalactic infrared (IR) background radiation. In this paper, we consider the case in which the produced pairs inverse-Compton-scatter low-energy photons up to γ-ray energies and start a pair-Compton cascade in the IR/microwave background. The simulation of such cascades over the enormous distances from high-redshift sources required us to develop a new matrix method to carry out the propagation. We find that the TeV γ-ray fluxes are only marginally higher for the case with cascading than they are for the case of absorption only. However, the greatest difference occurs at lower energies, around 1 GeV where the pile-up of photons below the absorption feature results in a significant flattening in the observed spectrum relative to the emission spectrum.

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