A new source type of galactic cosmic rays

Abstract

Experimental data of PAMELA and AMS-02 on proton and helium spectra at high and very high energies as well as the excess of 10 - 300 GeV positron flux cannot be explained using the diffusive models of propagation of cosmic-rays accelerated at the supernova shocks and require the existence of nearby sources of cosmic rays at the distances less than one kpc. We consider active dwarf stars as possible sources of galactic cosmic rays in the energy range up to ˜ 1014 eV. The generation of high-energy cosmic rays should be accompanied by high-energy γ-ray emission, which may be detected. Here we present the SHALON long-term observation data aimed to search for γ-ray emission above 800 GeV from the active red dwarf stars: V962 Tau, V780 Tau, V388 Cas, V1589 Cyg, GJ 1078 and GL 851.1. The TeV gamma-ray emission mostly of aring type from these sources was detected. This result confirms that active dwarf stars are also the sources of high-energy galactic cosmic rays.