XMM-Newton observations of the extragalactic microquasar S26 and their implications for PeV cosmic rays

LEANDRO ABAROA; GUSTAVO E. ROMERO; GIULIO MANCUSO; FLORENCIA RIZZO

Proceedings of Science

Proceedings of Science

Lugar: Trieste; Año: 2024

1824-8039

The extragalactic microquasar S26 has the most powerful jets observed in accreting binaries, with 40−1a kinetic luminosity of 𝐿jet ∼ 10that the accretion power to the stellar black hole at the core of the system should be very super- Eddington, on the order of 𝐿acc ∼ 𝐿jet. However, the observed X-ray flux of this system, measured by the Chandra and XMM-Newton telescopes, indicates an apparent very sub-Eddington accretionerg s. According to the jet-disk symbiosis model, this implies≈ 1037 erg s−1, orders of magnitude smaller than the jet power. We presentluminosity of 𝐿here a preliminary investigation of the relationship between jet and disk power, analyze an X-ray observation of S26 obtained with XMM-Newton, and propose an explanation for the emission. We also examine the acceleration and distribution of the particles to discuss the feasibility of microquasars as potential PeVatron sources, exploring their ability to produce cosmic rays with energies of about 1 PeV or higher.