Active galactic nucleus

compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion – and possibly all – of the electromagnetic spectrum

Arp 55 NE Messier 89 Messier 91 Messier 98 Messier 100 Arp 299 Markarian 177 Seyfert galaxy radio galaxy Arp 47 Arp 187 MS 1512-cB58 quasar Ton 951

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