Cosmic ray acceleration in Hypernova remnants expanding into wind bubbles of progenitor stars of Wolf-Rayet type
|1Masliukh, VO, 1Hnatyk, BI |
1Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
|Section: Extragalactic Astronomy|
One of actual problems of modern astrophysics is the origin of observed cosmic rays with energy more than 1017 eV, that exceeds the expected energy in the case of accelerating the cosmic rays by Supernova remnants in our galaxy. One of the possible sources of galactic cosmic rays with energies up to 1019 eV are remnants of Hypernovae, superpower Supernova explosions whose precursors are considered to be massive Wolf — Rayet stars. We analyse the characteristics of cosmic ray acceleration in Hypernova remnants expanding into wind bubbles of stars-precursors of the Wolf — Rayet type. It is shown that the maximum values for the energy of such cosmic rays, even when selecting relatively conservative acceleration process values, reach 1018 eV. Their contribution to the observed in the Earth’s vicinity flux of cosmic rays with energies from 1016 to 1018 eV is found to be several tens of percents at the frequency of Hypernova explosions in the Galaxy for the present era NS = 10-4 year-1.
|Keywords: cosmic rays, Hypernova, progenitor stars of Wolf-Rayet type|