Reconnection injects suprathermal protons during cosmological magnetogenesis yielding a ~10^{-7} nonthermal energy fraction that provides only a minor seed for later shock acceleration.
Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
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abstract
Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
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A review summarizing current challenges in radio observations of supernova remnants and the expected scientific gains from SKA-era instruments.
Reviews IceCube neutrino results, models Galactic plane flux from cosmic ray interactions with the interstellar medium, and discusses prospects for identifying PeVatrons via LHAASO sources.
citing papers explorer
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Reconnection-Driven Injection and Stochastic Reacceleration during Cosmological Magnetogenesis
Reconnection injects suprathermal protons during cosmological magnetogenesis yielding a ~10^{-7} nonthermal energy fraction that provides only a minor seed for later shock acceleration.
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Supernova remnants in the new radio astronomy era
A review summarizing current challenges in radio observations of supernova remnants and the expected scientific gains from SKA-era instruments.
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IceCube Results and Perspective for Neutrinos from LHAASO Sources
Reviews IceCube neutrino results, models Galactic plane flux from cosmic ray interactions with the interstellar medium, and discusses prospects for identifying PeVatrons via LHAASO sources.