908 citations · 17.1k across the 335 of their papers we have counts for
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Cosmic Star Formation Rate From Gamma-Ray Attenuation
T. M. Kneiske, K. Mannheim
We compute the attenuation of gamma-rays from remote quasars due to interactions with ambient low-energy photons produced by stars in galaxies and show that the next-generation gam…
Particle acceleration by rotating magnetospheres in active galactic nuclei
F. M. Rieger, K. Mannheim
We consider the centrifugal acceleration of charged test particles by rotating magnetospheres which are widely believed to be responsible for the relativistic jet phenomenon in act…
The sun as a high energy neutrino source
Christian Hettlage, Karl Mannheim, John G. Learned
Cosmic ray interactions in the solar atmosphere yield a flux of electron and muon neutrinos with energies greater than 10 GeV. We discuss the influence of neutrino oscillations on…
New bright soft X-ray selected ROSAT AGN II. Optical emission line properties
D. Grupe, K. Beuermann, K. Mannheim +1
We present the emission line properties of a sample of 76 bright soft X-ray selected ROSAT Active Galactic Nuclei. All optical counterparts are Seyfert 1 galaxies with rather narro…
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…
Frontiers in High-Energy Astroparticle Physics
Karl Mannheim
With the discovery of evidence for neutrino mass, a vivid gamma ray sky at multi-TeV energies, and cosmic ray particles with unexpectedly high energies, astroparticle physics curre…