arXiv subjects

Christian Hettlage

Publications and source records attributed to Christian Hettlage.

4 recordsLinked to original sources

arXiv2002

Neutrino Flux Bounds and Prospects for High Energy and Ultrahigh Energy Neutrino Source Detection

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 inner Earth and neutrino detection in water-based Cerenkov detectors. Applying the formalism thus developed to the Mannheim-Protheroe-Rachen and the Waxman&Bahcall flux bounds, we find that event rates of several hundred to thousand events per year might be possible in next-generation neutrino telescopes. However, a tomography of the inner Earth will face severe constraints due to the statistical error of the event rates to be expected.

astro-ph↗

arXiv2001

High Energy Neutrino Fluxes from Cosmic Accelerators

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 possibly be detected by cubic-kilometer neutrino telescopes.

astro-ph↗

arXiv2000

Magnetic field strength from peaked synchrotron spectra

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 low-energy electron spectrum. We investigate the effect of physically viable assumptions about the low-energy electron spectrum on the magnetic field strength as inferred from the position of the peak in the synchrotron spectrum marking the transition from optically thick to optically thin radiation. To this end the kinetic equations are written down and stationary solutions are given. In this context the inviability of the delta function approximation of the synchrotron power spectrum is discussed. Using two different approaches, we show that the field determination is independent of the assumptions about the low energy electron spectrum within an order of magnitude. As an example, we use our result to obtain a small correction to the limiting brightness temperature.

astro-ph↗

arXiv1999

The sun as a high energy neutrino source

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 the event rates in water-based Cerenkov detectors due to this neutrino flux and comment on the possibility of detecting the sun as a high energy neutrino source.

astro-ph↗