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Photohadronic Processes in Astrophysical Environments

Published online by Cambridge University Press:  05 March 2013

A. Mücke ,
J. P. Rachen ,
Ralph Engel ,
R. J. Protheroe  and
Todor Stanev
A. Mücke
Affiliation:
Department of Physics and Mathematical Physics, University of Adelaide Adelaide, SA 5005, Australia; amuecke@physics.adelaide.edu.au
J. P. Rachen
Affiliation:
Department of Astronomy, Pennsylvania State University, University Park, PA 16802, USA; jorg@astro.psu.edu
Ralph Engel
Affiliation:
Bartol Research Institute, University of Delaware, Newark, DE 19716, USA; eng@lepton.bartol.udel.edu
R. J. Protheroe
Affiliation:
Department of Physics and Mathematical Physics, University of Adelaide Adelaide, SA 5005, Australia; rprother@physics.adelaide.edu.au
Todor Stanev
Affiliation:
Bartol Research Institute, University of Delaware, Newark, DE 19716, USA; stanev@bartol.udel.edu
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Abstract

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We discuss the first applications of our newly developed Monte Carlo event generator SOPHIA to multiparticle photoproduction of relativistic protons with thermal and power-law radiation fields. The measured total cross section is reproduced in terms of excitation and decay of baryon resonances, direct pion production, diffractive scattering, and non-diffractive multiparticle production. Non-diffractive multiparticle production is described using a string fragmentation model. We demonstrate that the widely used ‘Δ-approximation’ for the photoproduction cross section is reasonable only for a restricted set of astrophysical applications. The relevance of this result for cosmic ray propagation through the microwave background and hadronic models of active galactic nuclei and gamma-ray bursts is briefly discussed.

Keywords

nuclear reactionselementary particlesradiation mechanisms: non-thermal
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 16 , Issue 2 , 1999 , pp. 160 - 166
Copyright
Copyright © Astronomical Society of Australia 1999

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