Abstract
Abstract. It is generally believed that the cosmic ray spectrum below the knee is of Galactic origin, although the exact sources making up the entire cosmic ray energy budget are still unknown. Including effects of magnetic amplification, Supernova Remnants (SNR) could be capable of accelerating cosmic rays up to a few PeV and they represent the only source class with a sufficient non-thermal energy budget to explain the cosmic ray spectrum up to the knee. Now, gamma-ray measurements of SNRs for the first time allow to derive the cosmic ray spectrum at the source, giving us a first idea of the concrete, possible individual contributions to the total cosmic ray spectrum. In this contribution, we use these features as input parameters for propagating cosmic rays from its origin to Earth using GALPROP in order to investigate if these supernova remnants reproduce the cosmic ray spectrum and if supernova remnants in general can be responsible for the observed energy budget.
Highlights
The origin of high energy cosmic rays (CR) remains uncertain, supernova remnants are being promoted as the most promising candidates for providing the CR flux up to PeV energies measured at Earth (Fermi, 1949; Blandford and Ostriker, 1978; Hillas, 2005)
By using X-ray and radio data of those sources it can be identified whether hadronic or leptonic processes caused the very high energy (VHE) gamma rays. This differentiation has been conducted in Mandelartz and Becker Tjus (2015). This approach allows the derivation of jp(E), which gives information about a potential population of CR protons inside the Supernova Remnants (SNR)
Gebauer and another anonymous referee. In this proceeding we have introduced a procedure to predict the CR flux measured at Earth up to the knee
Summary
The origin of high energy cosmic rays (CR) remains uncertain, supernova remnants are being promoted as the most promising candidates for providing the CR flux up to PeV energies measured at Earth (Fermi, 1949; Blandford and Ostriker, 1978; Hillas, 2005). By using X-ray and radio data of those sources it can be identified whether hadronic or leptonic processes caused the very high energy (VHE) gamma rays This differentiation has been conducted in Mandelartz and Becker Tjus (2015). This approach allows the derivation of jp(E), which gives information about a potential population of CR protons inside the SNRs. Since CR become deflected due to their electric charge by magnetic fields, and energy loss processes happen in interactions with Galactic gas clouds, it is impossible to directly extract information of those CRs regarding original direction and energy release by their SNR of origin. We do not present any optimization of model parameters, and all shown results are preliminarily ranked
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