Ultrahigh-energy neutrinos as a probe of espresso-shear acceleration in jets of Centaurus A

Abstract

It has been suggested that Centaurus A (Cen A) could make a contribution to the observed ultrahigh-energy cosmic-ray (UHECR) flux. We calculate the flux of astrophysical neutrinos produced by UHECRs accelerated in the jet of Cen A, a close-by jetted active galactic nucleus. We use a bottom-up approach, in which we follow the energization of protons and heavier elements in a magnetohydrodynamic simulation of a relativistic jet with proper parameters of Cen A, also accounting for attenuation losses based on the observed photon fields. We compare the expected neutrino flux with the sensitivity of current and planned neutrino detectors. We find that the detection of $\sim 10^{17}$-$10^{18}$ eV neutrinos from Cen A would require ultimate neutrino detectors that reach a point source sensitivity of $\sim \mathrm{a}\mathrm{few}\times 10^{-13}\mathrm{erg}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$. Successful detection, though challenging, would be useful in constraining the Cen A contribution to the UHECRs.

arXiv comment5 pages, 3 figures, Published in PRD

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