Ultra high energy cosmic rays from past activity of Andromeda galaxy by V. N. Zirakashvili et al. on Wednesday 30 November

It is shown that the relativistic jets associated with the growth and past

activity of the supermassive black hole in the Andromeda galaxy could be the

main source of cosmic rays with energies above $10^{15}$ eV. Most of the cosmic

ray energy is related to a bow shock of the jet that produces multi-PeV cosmic

rays with light composition. The highest energy cosmic rays with heavy

composition are produced in the jet itself. The spectra of energetic particles

produced in Andromeda galaxy and propagated to the Earth are calculated and

compared with observations.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.04522v2