Galactic Modulation of Extragalactic Cosmic Rays : A Possible Origin of the Knee in the Cosmic Ray Spectrum(Astrophysics and Relativity)

概要

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The existence of the spectral break near 3×10^<15> eV in the cosmic ray spectrum (referred to as the 'knee') is one of the biggest questions in cosmic ray astrophysics. In addition, the origin of cosmic rays above the knee energies (between 10^<15> and 10^<18> eV) is also yet unknown. In this paper, we investigate how the hypothetical extragalactic CRs, after modulation by the galactic wind, contribute to the knee in the CR spectrum. We numerically calculate the modulated energy spectrum of the hypothetical cosmic rays coming into the galaxy from just outside of the "galactic sphere", where the galactic wind terminates. We show that the observed knee structure is reproduced precisely by a superposition of the modulated component and the galactic cosmic rays originating from supernova remnants.
理論物理学刊行会の論文
2005-04-25