arXiv subjects

A. P. Szabo

Publications and source records attributed to A. P. Szabo.

3 recordsLinked to original sources

arXiv1994

Implications of Particle Acceleration in Active Galactic Nuclei for Cosmic Rays and High Energy Neutrino Astronomy

We consider the production of high energy neutrinos and cosmic rays in radio-quiet active galactic nuclei (AGN) or in the central regions of radio-loud AGN. We use a model in which acceleration of protons takes place at a shock in an accretion flow onto a supermassive black hole, and follow the cascade that results from interactions of the accelerated protons in the AGN environment. We use our results to estimate the diffuse high energy neutrino intensity and cosmic ray intensity due to AGN. We discuss our results in the context of high energy neutrino telescopes under construction, and measurements of the cosmic ray composition in the region of the ``knee'' in the energy spectrum at $\sim 10^7$ GeV.

astro-ph↗

arXiv1994

The effect of triplet production on pair-Compton cascades in thermal radiation

We calculate the spectrum of photons resulting from electromagnetic cascades through thermal radiation, and examine the consequences of including triplet production in these cascades. We assume that the cascade is one-dimensional, and we find that this approximation is justified in the present work for thermal radiation with temperature less than $10^{-3} mc^2$. Results are obtained for both monoenergetic and power-law primary spectra, and for a variety of path lengths. We find that triplet production is particularly important in electron--photon cascades through thermal radiation when the primary energy exceeds $10^5 m^2c^4/kT$ for propagation over small path lengths. The importance of triplet production decreases as the path length increases, and it has no effect on saturated cascades.

astro-ph↗

arXiv1994

"The Contribution of Active Galactic Nuclei to the Diffuse Gamma Ray Background"

We consider the emission of high energy to very high energy $γ$-rays in radio-quiet active galactic nuclei (AGN) or the central regions of radio-loud AGN. We use our results to estimate the $γ$-ray flux from the central regions of nearby AGN, and then to calculate the contribution to the diffuse $γ$-ray flux from unresolved AGN.

astro-ph↗