Many shell supernova remnants are now known to radiate synchrotron X-rays. Several
objects have also been detected in TeV gamma rays. Nonthermal X-rays and gamma rays …

Theoretical work on various processes by which shock waves accelerate cosmic rays is
reviewed. The most efficient of these processes, Fermi acceleration, is singled out for special …

Among the various acceleration mechanisms which have been suggested as responsible for
the nonthermal particle spectra and associated radiation observed in many astrophysical …

We present evidence for the existence of shock waves caused by the formation of the large-
scale structure. In some clusters of galaxies peripherally located sources of extended diffuse …

The origin of the sharp near infrared cutoff in the continuous energy distribution of many
compact non-thermal sources (BL Lacs. OVVs. red quasars and certain jets) is considered …

We investigate the spectrum of photohadronically produced neutrinos at very high energies
(VHE,≳ 10 14 eV) in astrophysical sources whose physical properties are constrained by …

The gamma-ray energy spectra of bright blazars of the LAT Bright AGN Sample (LBAS) are
investigated using Fermi-LAT data. Spectral properties (hardness, curvature, and variability) …

Context. Recent observations of hard X-rays and very high energy gamma-rays from a
number of young shell type supernova remnants indicate the importance of detailed …

The diffusive shock acceleration process can accelerate particles to a maximum energy
depending on the shock speed and age and on any competing loss processes on the …

We report new observations in the optical, near-infrared, millimetre, and radio bands of five
bright radio hot spots in classical double radio sources, including the first detections in the …