10 papers
How relevant is the torus activity/geometry for the TeV gamma-rays emitted in the jet of M87 ?
A. -C. Donea, R. J. Protheroe
Motivated by unification schemes of active galactic nuclei, we review evidence for the existence of a small-scale dust torus in M87, a Fanaroff-Riley Class I radio galaxy. Since th…
Neutrino Emission from HBLs and LBLs
A. Muecke, R. J. Protheroe
The Synchrotron Proton Blazar model is a promising model to explain high energy emission from gamma-ray loud BL Lac objects like Mkn 421. In contrast to leptonic models, the hadron…
Estimating jet power in proton blazar models
R. J. Protheroe, A. Mücke
We discuss the various contributions to the jet luminosity in proton blazar models of active galactic nuclei and describe a method of estimating the jet luminosity from the observe…
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…
SN 1998bw--GRB 980425: A supernova explosion with a close massive companion?
R. J. Protheroe, W. Bednarek
Some gamma ray bursts may be produced by supernovae exploding in close massive binary systems (type Ib/c supernovae) as suggested by the recent observation of SN 1998bw/GRB 980425.…
Acceleration and Interaction of Ultra High Energy Cosmic Rays
R. J. Protheroe
In this chapter I give an overview of shock acceleration, including a discussion of the maximum energies possible and the shape of the spectrum near cut-off, interactions of high e…