Ultra-high-energy (UHE,> 0.1 PeV) γ-ray astronomy is rapidly evolving into an expanding
branch of γ-ray astronomy with the surprising discovery of 12 PeVatrons and the detection of …

In cosmic ray physics extensive progress has been made in recent years, both concerning
theory and observation. The vast details in direct, indirect and secondary detections on the …

The identification of the main contributors to the locally observed fluxes of cosmic rays is a
prime objective in the resolution of the long-standing enigma of the source of cosmic rays …

We report on a∼ 5σ detection of polarized 3–6 keV X-ray emission from the supernova
remnant Cassiopeia A (Cas A) with the Imaging X-ray Polarimetry Explorer (IXPE). The …

When I started working on my PhD project on X-ray spectroscopy of supernova remnants in
1995, one of the things that I missed was a good textbook covering the various aspects of …

We report a characterization of the multiband flux variability and correlations of the nearby
(z= 0.031) blazar Markarian 421 (Mrk 421) using data from Metsähovi, Swift, Fermi-LAT …

We give a brief review of the origin and acceleration of cosmic rays (CRs), emphasizing the
production of CRs at different stages of supernova evolution by the first-order Fermi shock …

Supernova remnants are commonly considered to produce most of the Galactic cosmic rays
via diffusive shock acceleration. However, many questions regarding the physical conditions …

Observations of the Milky Way at TeV–PeV energies reveal a bright diffuse flux of hadronic
cosmic rays and also bright point sources of gamma rays. If the gamma-ray sources are …

Shell-type supernova remnants (SNRs) are considered prime candidates for the
acceleration of Galactic cosmic rays (CRs) up to the knee of the CR spectrum at E≈ 3× 10 …