23 verified PDFs
The study of ultra-high energy photons offers an indirect insight into cosmic rays. A detection of a photon at the highest energies would provide important ...
cosmic rays to petaelectronvolt (PeV) energies ... high energies is the internal absorption of gamma rays by two-photon annihilation.
Ultrahigh-energy photons up to 1.4 petaelectronvolts from 12 γ-ray Galactic sources,. Nature 594 (2021) 33. [579] HAWC collaboration ...
by DJ Thompson · 2012 — Some clusters of galaxies were predicted to be gamma-ray sources. None are seen in the Second LAT. Catalog, indicating that the predictions were too optimistic.
It shows that in general the absorption can be important for gamma rays with E𝛾 ≲ 100 TeV. Thus we take into account the absorption due to the UV photon field ...
Ultrahigh-energy photons up to 1.4 petaelectronvolts from 12 gamma-ray Galactic sources. Nature, 594(7861), 33–36. doi:10.1038/s41586-021-03498-z. Cao, Z ...
Abstract. Several gamma-ray observatories have discovered photons of cosmic origin with energies in the PeV (1015 eV) range.
Hence, photons in the PeV range emitted from photon PeVatrons can be seen as indicative for charged-particle acceleration to energies beyond the PeV scale at ...
The best way to probe particle acceleration up to the PeV range, is (so far) through gamma-ray observations, in the very-high-energy range (VHE, ...
GRAPES-3 stands for Gamma Ray Astronomy at PeV EnergieS phase-3. It is an extensive air shower array experiment, located at Ooty in India (11.4 ...
Abstract: In this work, I present a qualitative discussion on the prospect of production of ultra-high photons in blazars.
Abstract. The diffuse gamma radiation arising from the interaction of cosmic ray particles with matter and radiation in the Galaxy is one of the few probes ...
The output is not large, about 4 photons per meter, but the number of shower particles in UHECR showers is very large, and the shower can be seen from distances ...
For biological reasons, our perception of the Universe is based on the observation of photons, most trivially by staring at the night sky with our bare eyes.
It contains the photons of the cosmic microwave background that have density of more than 400/cm3. The highest energy cosmic rays interact with the CMB and ...
Recent observations by atmospheric Cherenkov telescopes such as H.E.S.S. and MAGIC have revealed a large number of new sources of very-high-energy.
Scientists know that the diffuse gamma-ray glow that suffuses the Milky Way is mainly produced by the interaction of high-energy cosmic rays ...
There are now 48 known Galactic sources of very-high-energy gamma rays [7], including supernova remnants, pulsar wind nebulae, X-ray binaries, molecular clouds, ...
The newly cataloged astrophysical gamma-ray sources have energies about 10 times higher than can be produced using experimental particle ...
The LHAASO observatory has identified a population of PeVatrons close to the galactic center, with photons reaching up to 1.4 PeV. In this study, two ...
