Results 31 to 40 of about 163,915 (242)

Galactic cosmic rays

open access: yesEPJ Web of Conferences, 2015
The multi-facet nature of the origin of cosmic rays is such that some of the problems currently met in our path to describing available data are due to oversimplified models of CR acceleration and transport, and others to lack of knowledge of the ...
Blasi Pasquale
doaj   +1 more source

Cosmic rays and molecular clouds

open access: yes, 2012
This paper deals with the cosmic-ray penetration into molecular clouds and with the related gamma--ray emission. High energy cosmic rays interact with the dense gas and produce neutral pions which in turn decay into two gamma rays.
A Atoyan   +96 more
core   +3 more sources

Theoretical approaches to particle propagation and acceleration in turbulent intergalactic medium [PDF]

open access: yes, 2006
Intercluster medium is expected to be turbulent with turbulence being superAlfvenic at large scales. Magnetic fields substantially modify the turbulent cascade when the turbulence reaches the scales at which the fluctuation velocity gets less than the ...
Lazarian, A.
core   +3 more sources

New generation Cherenkov telescope array: HADAR and its performance introduction

open access: yesNuclear Physics B
Astrophysical very high energy (VHE) gamma-rays are believed to result almost exclusively from the interactions of populations of highly relativistic particles with ambient matter or photon fields.
Qingyuan Hou   +18 more
doaj   +1 more source

One century of cosmic rays – A particle physicist's view

open access: yesEPJ Web of Conferences, 2015
Experiments on cosmic rays and the elementary particles share a common history that dates back to the 19th century. Following the discovery of radioactivity in the 1890s, the paths of the two fields intertwined, especially during the decades after the ...
Sutton Christine
doaj   +1 more source

Are gamma-ray bursts the sources of ultra-high energy cosmic rays? [PDF]

open access: yes, 2014
We reconsider the possibility that gamma-ray bursts (GRBs) are the sources of the ultra-high energy cosmic rays (UHECRs) within the internal shock model, assuming a pure proton composition of the UHECRs.
Baerwald, Philipp   +2 more
core   +1 more source

Messengers of the Universe-Cosmic Rays Exploring Supermassive Black Holes

open access: yesGalaxies, 2020
Cosmic rays were discovered over one hundred years ago but there are still unsolved problems. One of the hot problems is the origin of cosmic rays of the highest energies.
Anna Uryson
doaj   +1 more source

Neutrinos and Cosmic Rays Observed by IceCube [PDF]

open access: yes, 2017
The core mission of the IceCube Neutrino observatory is to study the origin and propagation of cosmic rays. IceCube, with its surface component IceTop, observes multiple signatures to accomplish this mission.
Aartsen, M. G.   +306 more
core   +1 more source

The GRAND project and GRANDProto300 experiment [PDF]

open access: yesEPJ Web of Conferences, 2019
The Giant Array for Neutrino Detection (GRAND) is a proposal for a giant observatory of ultra-high energy cosmic particles (neutrinos, cosmic rays and gamma rays). It will be composed of twenty subarrays of 10 000 antennas each, totaling a detection area
Martineau-Huynh Olivier
doaj   +1 more source

The origin of cosmic rays and TeV gamma-ray astronomy

open access: yesEPJ Web of Conferences, 2013
Cosmic rays are accelerated to high energies in Galactic and extragalactic objects like Supernova remnants (SNR) and active galactic nuclei (AGN). How these accelerators work and how efficient they accelerate different types of particles to energies of ...
Maier Gernot
doaj   +1 more source

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