Galactic nuclei

An active galactic nucleus (AGN) is a compact region at the centre of a galaxy that has a much higher than normal luminosity over at least some portion, and possibly all, of the electromagnetic spectrum. Such excess emission has been observed in the radio, microwaves, infrared, optical, ultra-violet, X-ray and gamma ray wavebands. A galaxy hosting an AGN is called an active galaxy. The radiation from AGN is believed to be a result of accretion of mass by a supermassive black hole at the centre of its host galaxy. AGN are the most luminous persistent sources of electromagnetic radiation in the universe, and as such can be used as a means of discovering distant objects; their evolution as a function of cosmic time also puts constraints on models of the cosmos.

In 5033 OTT a long distance expedition left Union space and the M-0 Galaxy to reach M 87 and conduct research on the M 87 Jet and to investigate the apparent sentient message embedded in the pulse Jet ( 16.4 million parsecs (53.5 million light-years away) --> See M 87 Expedition.