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Ultra-high energy cosmic rays from radio galaxies revisited
Jorg P. Rachen
A striking concentration of ultra-high energy cosmic ray (UHECR) events observed by the Pierre Auger Observatory around the direction of the nearby radio galaxy Centaurus A revives…
BL Lac Objects in the Synchrotron Proton Blazar Model
A. Muecke, R. J. Protheroe, R. Engel +2
We calculate the spectral energy distribution (SED) of electromagnetic radiation and the spectrum of high energy neutrinos from BL Lac objects in the context of the Synchrotron Pro…
The relation of extragalactic cosmic ray and neutrino fluxes: the logic of the upper bound debate
Jorg P. Rachen, R. J. Protheroe, Karl Mannheim
In a recent paper, Waxman and Bahcall (PRD 59, 023002) claimed that the present data on ultra-high energy cosmic rays imply a model-independent upper bound on extragalactic neutrin…
On the cosmic ray bound for models of extragalactic neutrino production
K. Mannheim, R. J. Protheroe, J. P. Rachen
We obtain the maximum diffuse neutrino intensity predicted by hadronic photoproduction models of the type which have been applied to the jets of active galactic nuclei or gamma ray…
Cosmic Rays and Neutrinos from Gamma Ray Bursts
Jorg P. Rachen, P. Meszaros
We review the hypothesis that the acceleration of protons at internal shocks in Gamma Ray Bursts (GRB) could be the origin of the ultra-high energy cosmic rays (UHECR) observed at…
On photohadronic processes in astrophysical environments
A. Muecke, J. P. Rachen, R. Engel +2
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 radi…
Photohadronic Neutrinos from Transients in Astrophysical Sources
Jorg P. Rachen, P. Meszaros
We investigate the spectrum of photohadronically produced neutrinos at very high energies (VHE, >10^14 eV) in astrophysical sources whose physical properties are constrained by the…
Contributions to the Cosmic Ray Flux above the Ankle: Clusters of Galaxies
Hyesung Kang, Jörg P. Rachen, Peter L. Biermann
Motivated by the suggestion of Kang, Ryu \& Jones (1996) that particles can be accelerated to high energies via diffusive shock acceleration process at the accretion shocks formed…
The origin of soft X-rays in luminous AGN
K. Mannheim, M. Schulte, J. Rachen
We predict that the UV bump spectrum of quasars extends into the soft X-ray range with a steep power law. For radio-louds, the spectral index is alpha_s ~ 1.7 (S_nu = S_o nu^-alpha…