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We can detect amounts of electromagnetic radiation being emitted from the centers of galaxies that correlate with those emitted by black holes, as well behavior associated with behavior of black holes whenever amounts of material enter the 'sphere of influence' of the black hole, i.e. the accretion disks found near AGNs being sucked into the theoretical super-massive black hole.
They are all around us. Radio waves are emitted by radio and television stations; they are also used by wireless communications (for example, Wi-Fi, Bluetooth).We also receive radio waves from outer space; for example, from AGNs (active galactic nuclei).
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Takamitsu Miyaji has written: 'The X-ray flux dipole of AGNs and the peculiar motion of the local group' -- subject(s): X-ray sources, Galactic, Galactic nuclei