Implications of supernova remnant origin model of galactic cosmic rays on Gamma rays from young supernova remnants - INSPIRE

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Implications of supernova remnant origin model of galactic cosmic rays on Gamma rays from young supernova remnants

Jun 7, 2017

8 pages

Published in:

Phys.Rev.D 95 (2017) 12, 123014

Published: Jun 26, 2017

e-Print:

1706.02080 [astro-ph.HE]

DOI:

10.1103/PhysRevD.95.123014

View in:

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Abstract: (APS)

It is widely believed that Galactic cosmic rays are originated in supernova remnants (SNRs), where they are accelerated by a diffusive shock acceleration (DSA) process in supernova blast waves driven by expanding SNRs. In recent theoretical developments of the DSA theory in SNRs, protons are expected to accelerate in SNRs at least up to the knee energy. If SNRs are the true generators of cosmic rays, they should accelerate not only protons but also heavier nuclei with the right proportions, and the maximum energy of the heavier nuclei should be the atomic number (Z) times the mass of the proton. In this work, we investigate the implications of the acceleration of heavier nuclei in SNRs on energetic gamma rays produced in the hadronic interaction of cosmic rays with ambient matter. Our findings suggest that the energy conversion efficiency has to be nearly double for the mixed cosmic ray composition compared to that of pure protons to explain observations. In addition, the gamma-ray flux above a few tens of TeV would be significantly higher if cosmic ray particles could attain energies Z times the knee energy in lieu of 200 TeV, as suggested earlier for nonamplified magnetic fields. The two stated maximum energy paradigms will be discriminated in the future by upcoming gamma-ray experiments like the Cherenkov telescope array (CTA).

Note:

8 pages, 5 figures. To appear in Phys. Rev. D

95.85.Ry
95.85.Pw
gamma rays
Supernova remnant

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Figures(5)

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