19 papers
Neutrino Flux Bounds and Prospects for High Energy and Ultrahigh Energy Neutrino Source Detection
Christian Hettlage, Karl Mannheim
After briefly reviewing various hadronic neutrino source models, we show how to construct generic upper flux bounds. We then turn to the problem of neutrino propagation through the…
High Energy Neutrino Fluxes from Cosmic Accelerators
Christian Hettlage, Karl Mannheim
We constrain high-energy neutrino fluxes with the observed cosmic ray and gamma ray fluxes, include flavor oscillations and propagation through Earth, and show that blazars could p…
Implications of a possible 23 day periodicity for binary black hole models in Mkn~501
F. M. Rieger, K. Mannheim
We investigate the implications of a massive binary system in the centre of the gamma-ray blazar Mkn~501 and show that the periodical behaviour recently observed in the TeV and X-r…
Magnetic field strength from peaked synchrotron spectra
Christian Hettlage, Karl Mannheim
Key diagnostics of non-thermal plasmas, such as the position of the synchrotron self-absorption turnover or the Faraday rotation optical depth, depend crucially on the unobserved l…
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…