Luminosity of ultrahigh energy cosmic rays and bounds on magnetic luminosity of radio-loud active galactic nuclei

TL;DR

This paper compares magnetic flux production in active galactic nuclei with ultrahigh energy cosmic ray luminosities, suggesting constraints on AGN properties for cosmic ray acceleration.

Contribution

It provides a novel comparison between theoretical magnetic luminosities and observed UHECR luminosities in AGNs, constraining their magnetic and dynamic properties.

Findings

Magnetic luminosity bounds match UHECR luminosities for certain black hole spins.

Results can help constrain AGN magnetic and dynamic characteristics.

Supports AGNs as potential sources of ultrahigh energy cosmic rays.

Abstract

We investigate the production of magnetic flux from rotating black holes in active galactic nuclei (AGNs) and compare it with the upper limit of ultrahigh energy cosmic ray (UHECR) luminosities, calculated from observed integral flux of GeV-TeV gamma rays for nine UHECR AGN sources. We find that, for the expected range of black hole rotations (0.44<a<0.80), the corresponding bounds of theoretical magnetic luminosities from AGNs coincides with the calculated UHECR luminosity. We argue that such result possibly can contribute to constrain AGN magnetic and dynamic properties as phenomenological tools to explain the requisite conditions to proper accelerate the highest energy cosmic rays.