Cygnus A

Cygnus A (3C 405) is one of the brightest and best-known radio galaxies. The object was discovered in 1939 by Grote Reber; as a collection of discrete objects, it was identified by James Stanley Hey and colleagues in 1946 in England and 1953 were Roger Jennison and Mrinal Kumar Das Gupta show that there is a double source. Like all other radio galaxies, these also contain an active galactic nucleus.

Images of the radio emission of astronomy show two jets that leave the galactic center in opposite directions and their expansion is a multiple of the extent of detectable in the visible light galaxy itself is .. The jets terminate in areas of very hot gas, which significantly by their radio emission are detectable. Here the Jetteilchen meet on the surrounding galaxy intergalactic medium which is to be strongly heated ..