Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-07
Prog.Theor.Phys. 113 (2005) 721-731
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Progress of Theoretical Physics
Scientific paper
10.1143/PTP.113.721
The existence of the spectral break around $\sim 3 \times 10^{15}$ eV in the cosmic ray spectrum (referred to as the `knee') is one of the biggest questions in cosmic ray astrophysics. At the same time, the origin of cosmic rays above the knee energies (between 10$^{15}$ and 10$^{18}$ eV) is also still unsettled. In this paper, we investigate how the hypothetical extragalactic CRs after modulated 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 well by a superposition of the modulated component and the galactic cosmic rays originating in supernova remnants.
Muraishi Hiroshi
Yanagita Shohei
Yoshida Tatsuo
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