Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke1586p&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 1586. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Galaxies, Active Galaxies, Quasars And Galactic Nuclei
Scientific paper
Objects known as `ACTIVE GALACTIC NUCLEI' (AGN) can be grouped into a wide variety of phenomenological subclasses that have many overlapping or similar properties. The first known `active galaxies' were the high-surface-brightness spiral galaxies identified by Carl Seyfert in 1943. Almost two decades later, the first radio surveys of the sky led to the identification of other objects (radio galax...
Murdin Paul
Peterson Bruce
Wilkes Belinda
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