Extragalactic and galactic sources: New evidence, new challenges, new opportunities
EPJ Web of Conferences, 2013 Recent data bring in sharper focus the issue of relative contributions of galactic and extragalactic sources of ultrahigh-energy cosmic rays. On the one hand, there is some new evidence, from gamma-ray observations of blazars, that cosmic rays are ...
Kusenko Alexander
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Recurrent variations of anomalous oxygen in association with a corotating interaction region [PDF]
Annales Geophysicae, 1996 The fluxes of anomalous oxygen (E ranging from 3.5-6.8 MeV/amu), as measured by the EPAC instrument on ULYSSES, show a recurrent variation with the solar rotation period, which is anticorrelated with the fluxes of particles accelerated at the shocks ...
M. K. Reuss, M. Fränz, E. Keppler
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Ultrahigh-energy cosmic-ray nuclei from black hole jets: Recycling galactic cosmic rays through shear acceleration [PDF]
, 2017 We perform Monte Carlo simulations of transrelativistic shear acceleration dedicated to a jet-cocoon system of active galactic nuclei. A certain fraction of galactic cosmic rays in a halo is entrained, and sufficiently high-energy particles can be ...
S. Kimura, K. Murase, B. Zhang
semanticscholar +1 more source
HAWC observations of the acceleration of very-high-energy cosmic rays in the Cygnus Cocoon [PDF]
Nature Astronomy, 2021 Cosmic rays with energies up to a few PeV are known to be accelerated within the Milky Way1,2. Traditionally, it has been presumed that supernova remnants were the main source of these very-high-energy cosmic rays3,4, but theoretically it is difficult to
A. Abeysekara +100 more
semanticscholar +1 more source
EPJ Web of Conferences, 2013 We discuss the basic features of the propagation of Ultra High Energy Cosmic Rays in astrophysical backgrounds, comparing two alternative computation schemes to compute the expected fluxes.
Aloisio Roberto
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GALACTIC AND EXTRAGALACTIC SUPERNOVA REMNANTS AS SITES OF PARTICLE ACCELERATION
Acta Polytechnica, 2013 Supernova remnants, owing to their strong shock waves, are likely sources of Galactic cosmic rays. Studies of supernova remnants in X-rays and gamma rays provide us with new insights into the acceleration of particles to high energies. This paper reviews
Manami Sasaki
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Measurement of Cosmic-ray Energy Spectrum with the TALE Detector in Hybrid Mode [PDF]
EPJ Web of Conferences, 2023 The TA Low-energy Extension (TALE) experiment extends the energy range observed by the TA experiment to below 1016 eV. We aim to study the transition from galactic to extragalactic cosmic rays.
Oshima Hitoshi +3 more
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Diffuse Cosmic Rays Shining in the Galactic Center: A Novel Interpretation of H.E.S.S. and Fermi-LAT γ-Ray Data. [PDF]
Physical Review Letters, 2017 We present a novel interpretation of the γ-ray diffuse emission measured by Fermi-LAT and H.E.S.S. in the Galactic center (GC) region and the Galactic ridge (GR).
D. Gaggero +4 more
semanticscholar +1 more source
The depth of the shower maximum of air showers measured with AERA [PDF]
EPJ Web of Conferences, 2023 The Auger Engineering Radio Array (AERA), as part of the Pierre Auger Observatory, is an array of radio antennas probing the nature of ultra-high energy cosmic rays at energies around the transition from Galactic to extra-galactic origin. It measures the
Pont Bjarni
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Galactic cosmic rays on extrasolar Earth-like planets - II. Atmospheric implications [PDF]
, 2016 Context. Theoretical arguments indicate that close-in terrestial exoplanets may have weak magnetic fields, especially in the case of planets more massive than Earth (super-Earths).
J. Grießmeier +5 more
semanticscholar +1 more source