Galactic Cosmic Rays: The first detection of TeV gamma-rays from Red Dwarfs

V.G Sinitsyna,V.Y Sinitsyna,Yu.I Stozhkov,B Pattison,H Menjo,Y Itow,T Sako

doi:10.1051/epjconf/201920814007

V.G Sinitsyna, V.Y Sinitsyna + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/201920814007

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Abstract

The present point of view on the sources of cosmic rays in Galaxy considers explosions of supernovae as sources of these particles up to energies of 1017 eV. However, the experimental data obtained with Pamela, Fermi, AMS-02 spectrometers requires the existence of nearby sources of cosmic rays at distances less then 1 kpc from the solar system. These sources could explain such experimental data as the growth of the ratio of galactic positrons to electrons with increasing energy, the complex dependence of the exponent of the proton and alpha spectra from the energy of these particles, the appearance of an anomaly component in cosmic rays. We consider active dwarf stars as possible sources of galactic cosmic rays in the energy range up to 1014 eV. These stars produce powerful stellar flares. The generation of high-energy cosmic rays has to be accompanied by high-energy gamma-ray emission. Here we present the SHALON long-term observation data aimed at searching for gamma-ray emission above 800 GeV from active red dwarf stars. The data obtained during more than 10 years observations of the dwarf stars V962 Tau, V780 Tau, V388 Cas and V1589 Cyg were analyzed. The high-energy gamma-ray emission in the TeV energy range, mostly of the flaring type from the sources mentioned above, was detected. This result confirms that active dwarf stars are also the sources of high-energy galactic cosmic rays.

Highlights

Supernova Remnants (SNRs) have long been considered as unique candidates for cosmic-ray sources [1, 2]
After processing Tycho’s SNR observation data first by selection criteria associated with Tycho’s SNR and with V388 Cas we found that less than 1% of showers are common for both sources
After processing the Cyg X-3 observation data first by selection criteria associated with Cyg X-3 and with V1589 Cyg we found that less than 2% of showers are common for both sources

Summary

Introduction

Supernova Remnants (SNRs) have long been considered as unique candidates for cosmic-ray sources [1, 2]. The experimental data obtained with the Pamela, Fermi, AMS02 spectrometers requires the existence of nearby sources of cosmic rays at distances < 1 kpc from the solar system. These sources could explain such experimental data as the growth of the ratio of galactic positrons to electrons with increasing energy (Fig. 1), the complex dependence of the exponent of the proton and alpha spectra from the energy of these particles, the appearance of an anomaly component in cosmic rays. We consider active dwarf stars as possible sources of galactic cosmic rays in the energy range up to 1014 eV. The data obtained during more than 10 years observations of the dwarf stars V962 Tau, V780 Tau, V388 Cas and V1589 Cyg were analyzed

Observations of Red dwarfs

V388 Cas

Findings

Discussion

Conclusion