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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

Diffusive shock acceleration at EeV and associated multimessenger flux from ultra-fast outflows driven by Active Galactic Nuclei

Enrico Peretti
  • Fonction : Auteur
Alessandra Lamastra
  • Fonction : Auteur
Francesco Gabriele Saturni
  • Fonction : Auteur
Markus Ahlers
  • Fonction : Auteur
Pasquale Blasi
  • Fonction : Auteur
Giovanni Morlino
  • Fonction : Auteur

Résumé

Active galactic nuclei (AGNi) can launch and sustain powerful winds featuring mildly relativistic velocity and wide opening angle. Such winds, known as ultra-fast outflows (UFOs), can develop a bubble structure characterized by a forward shock expanding in the host galaxy and a wind termination shock separating the fast cool wind from the hot shocked wind. In this work we explore whether diffusive shock acceleration can take place efficiently at the wind termination shock of UFOs. We calculate the spectrum of accelerated particles and find that protons can be energized up to the EeV range promoting UFOs to promising candidates for accelerating ultra-high energy cosmic rays (UHECRs). We also compute the associated gamma-ray and neutrino fluxes and compare them with available data in the literature. We observe that high-energy (HE) neutrinos are efficiently produced up to hundreds of PeV while the associated gamma rays are efficiently absorbed beyond a few tens of GeV. By assuming a typical source density of non-jetted AGNi we expect that UFO could play a dominant role as diffuse sources of UHECRs and HE neutrinos. We finally apply our model to the recently observed NGC1068 and we find out that an obscured UFO could provide a sizeable contribution to the observed gamma-ray flux while only contributing up to $\sim 10\%$ to the associated neutrino flux.
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Dates et versions

hal-03991022 , version 1 (03-01-2024)

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Enrico Peretti, Alessandra Lamastra, Francesco Gabriele Saturni, Markus Ahlers, Pasquale Blasi, et al.. Diffusive shock acceleration at EeV and associated multimessenger flux from ultra-fast outflows driven by Active Galactic Nuclei. Monthly Notices of the Royal Astronomical Society, 2023, 526 (1), pp.181-192. ⟨10.1093/mnras/stad2740⟩. ⟨hal-03991022⟩
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