نتایج جستجو برای: galactic cosmic ray
تعداد نتایج: 349069 فیلتر نتایج به سال:
An overview on the present observational status and phenomenological understanding of cosmic rays above 10 eV is given. Above these energies the cosmic ray flux is expected to be gradually dominated by an extra-galactic component. In order to investigate the nature of this transition, current experimental activities focus on the measurement of the cosmic ray flux and composition at the ’ankle’ ...
We study the propagation of mildly-relativistic cosmic rays (CRs) in multiphase interstellar medium environments with conditions typical nearby disk galaxies. employ techniques developed Armillotta+21 to post-process three high-resolution TIGRESS magnetohydrodynamic simulations modeling local patches star-forming galactic disks. Together, cover a wide range gas surface density, gravitational po...
If supernova remnants (SNRs) are the sites of cosmic-ray acceleration, the associated nuclear interactions should result in observable fluxes of TeV gamma-rays from the nearest SNRs. Measurements of the gamma-ray flux from six nearby, radio-bright, SNRs have been made with the Whipple Observatory gamma-ray telescope. No significant emission has been detected and upper limits on the >300 GeV flu...
Observational γ-ray astronomy was born some forty years ago, when small detectors were flown in satellites, following a decade of theoretical predictions of its potential to discover the origin of cosmic rays via the π-decay mechanism. The seventies were a golden era for γ-ray and cosmic-ray astrophysics, with the (re)discovery of the “diffuse shock acceleration” theory for cosmic rays, and the...
Short Title: Cosmic-ray electrons and diffuse gamma-ray spectrum 1 Abstract The bulk of the diffuse galactic gamma-ray emission above a few tens of GeV has been conventionally ascribed to the decay of neutral pions produced in cosmic-ray interactions with interstellar matter. Cosmic-ray electrons may, however, make a significant contribution to the gamma-ray spectrum at high energies, and even ...
There is mounting evidence from observations of long duration gamma ray bursts (GRBs), supernova remnants (SNR) and the supernova (SN) explosion 1987A, that SN explosions eject highly relativistic bipolar jets of plasmoids (cannonballs) of ordinary matter. The highly relativistic plasmoids sweep up the ambient matter in front of them, accelerate it to cosmic ray (CR) energies and disperse it al...
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