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Active galactic nucleus
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== Observational characteristics == Among the many interesting characteristics of AGNs:<ref name=PadovaniReview2017>{{Cite journal |last1=Padovani |first1=P. |last2=Alexander |first2=D. M. |last3=Assef |first3=R. J. |last4=De Marco |first4=B. |last5=Giommi |first5=P. |last6=Hickox |first6=R. C. |last7=Richards |first7=G. T. |last8=Smolฤiฤ |first8=V. |last9=Hatziminaoglou |first9=E. |last10=Mainieri |first10=V. |last11=Salvato |first11=M. |date=November 2017 |title=Active galactic nuclei: what's in a name? |url=http://link.springer.com/10.1007/s00159-017-0102-9 |journal=The Astronomy and Astrophysics Review |language=en |volume=25 |issue=1 |page=2 |doi=10.1007/s00159-017-0102-9 |issn=0935-4956|arxiv=1707.07134 |bibcode=2017A&ARv..25....2P }}</ref> * very high luminosity, visible out to very high [[red shift]]s, * small emitting regions, milli-parsecs in diameter, * strong evolution of [[Luminosity function (astronomy)|luminosity functions]], * detectable emission across the entire [[electromagnetic spectrum]].
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