Search Publications

Numerical modelling of gamma radiation from galaxy clusters

Miniati, Francesco

We investigate the spatial and spectral properties of non-thermal emission from clusters of galaxies at γ-ray energies. We estimate the radiation flux between 10 keV and 10 TeV due to inverse-Compton (IC) emission, π⁰-decay and non-thermal bremsstrahlung (NTB) from cosmic ray (CR) ions and electrons accelerated at cosmic shocks as well …

The brightness temperature problem in extreme intra-day variable quasars: a model for PKS 0405-385

Protheroe, R. J.

I re-examine the brightness temperature problem in PKS 0405-385, which is an extreme intra-day variable radio quasar with an inferred brightness temperature of ~5 × 10¹⁴ K at 5 GHz, well above the Compton catastrophe limit of ~10¹¹ K that is reached when the synchrotron photon energy density exceeds the energy density of the …