Ultrahigh energy cosmic ray nuclei from remnants of dead quasars

White paper on EUSO-SPB2

“…These regions are presumably produced when the bulk kinetic energy of the jets ejected by a central AGN is reconverted into UHECRs [46,47]. UHECR acceleration is also possible in polar cap regions of the black hole magnetosphere [48,49]. Centaurus A (Cen A) is the closest radiogalaxy to Earth and has long been suspected to be a potential UHECR accelerator [50,51].…”