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Published online by Cambridge University Press: 22 November 2011
The development of a variety of non-electromagnetic detectorswill drastically enlarge our global view on Galactic Nuclei andAGNs in the future. The possibility of detecting their non-photonicemission, namely ultra-high energy cosmic rays (UHECRs) and gravitationalwaves, may open new Windows on AGN physics in comingyears.