The current recorded signals of ultrahigh-energy $\gamma$-rays may come from EeVatrons in the galaxy

Abstract

A hard $\gamma$-ray spectrum of supernova remnant G106.3+2.7 can be explained by using the hadronic model with the gluon condensation effect. This implies that not only PeVatrons but also EeVatrons generally exist in the universe including our galaxy, and they can accelerate protons to beyond "ankle" ($10^{19}eV$). Although these proton beams are very weak in the galaxy and cannot be observed individually on the earth, the gluon condensation effect may greatly enhance the proton-proton cross section, which can compensate for the weak proton flux and produce the observed $\gamma$-rays. We also show that the gluon condensation effect in proton provides an efficient conversion mechanism for kinetic energy into $\gamma$-rays in the universe.

arXiv comment10 pages, 1 figure

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