The field of astroparticle physics is currently develo** rapidly, since new experiments
challenge our understanding of processes that have been investigated. Three messengers …

In the first part of this review we discuss the basic observational features at the end of the
cosmic ray (CR) energy spectrum. We also present there the main characteristics of each of …

Abstract In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing
the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and …

TeV BL Lacertae objects require extreme relativistic bulk motions in the gamma-ray
emission region, but at the VLBI scale their radio knots hardly move. The same sources …

The blazar Mrk 501 was observed at energies above 0.10 TeV with the MAGIC Telescope
from 2005 May through July. The high sensitivity of the instrument enabled the determination …

Gamma ray astronomy, the branch of high energy astrophysics that studies the sky in
energetic?-ray photons, is destined to play a crucial role in the exploration of nonthermal …

The detection of fast variations of the tera–electron volt (TeV)(1012 eV) γ-ray flux, on time
scales of days, from the nearby radio galaxy M87 is reported. These variations are about 10 …

We calculate the antiproton flux due to relic neutralino annihilations, in a two-dimensional
diffusion model compatible with stable and radioactive cosmic ray nuclei. We find that the …

The intrinsic flux of very high-energy (VHE, energy≳ 100 GeV) γ rays from extragalactic
sources<? format?> is attenuated due to pair production in the interaction with photons of …

Axionlike particles (ALPs) are hypothetical light (sub-eV) bosons predicted in some
extensions of the Standard Model of particle physics. In astrophysical environments …