Possible Spectra of Cosmic Rays Accelerated in Extragalactic Sources

Abstract

Spectra at the Earth of ultra-high energy cosmic rays (UHECR) from Seyfert nuclei with red shifts z<=0.0092 and from Blue Lacertae objects (BL Lac&#39;s) are calculated. The spectra are compared with the experimental data. It is shown that in nearby Seyferts the initial spectrum of the UHECRs is most likely the exponential one. UHECRs from BL Lac&#39;s may have the monoenergetic initial spectrum with the energy of 10^21 eV to fit to the data. Spectra at the Earth derived in these two models are very similar if there is no Bl Lac&#39;s with red shifts z<0.02. The maximal energy in cosmic rays seemingly does not exceed 10^21 eV. In calculations we used red shift distributions of the objects according to the recent (2001) catalogue of active nuclei by Veron-Cetty and Veron (see ref. in the text).