Type of active galaxy that is very luminous at radio wavelengths
This article is about the type of galaxy. For the UK radio network, see The Galaxy Network.
Alcyoneus, a giant radio galaxy with lobed structures spanning 5 megaparsecs (16×106 ly).
A radio galaxy is a galaxy with giant regions of radio emission extending well beyond its visible structure. These energetic radio lobes are powered by jets from its active galactic nucleus.[1] They have luminosities up to 1039 W at radio wavelengths between 10 MHz and 100 GHz.[2] The radio emission is due to the synchrotron process. The observed structure in radio emission is determined by the interaction between twin jets and the external medium, modified by the effects of relativistic beaming. The host galaxies are almost exclusively large elliptical galaxies. Radio-loud active galaxies can be detected at large distances, making them valuable tools for observational cosmology. Recently, much work has been done on the effects of these objects on the intergalactic medium, particularly in galaxy groups and clusters.
Alcyoneus is a low-excitation radio galaxy, identified as having the largest radio lobes found, with lobed structures spanning 5 megaparsecs (16×106 ly). For comparison, another similarly sized giant radio galaxy is 3C 236, with lobes 15 million light-years across. A giant radio galaxy is a special class of objects characterized by the presence of radio lobes generated by relativistic jets powered by the central galaxy's supermassive black hole. Giant radio galaxies are different from ordinary radio galaxies in that they can extend to much larger scales, reaching upwards to several megaparsecs across, far larger than the diameters of their host galaxies.
^David J. Adams; David John Adams; Alan Cayless; Anthony W. Jones (2004). Mark H. Jones; David J. Adams; Robert J. Lambourne (eds.). An Introduction to Galaxies and Cosmology. Cambridge University Press. pp. 142–144. ISBN 978-0-521-54623-2.
^"9.3 Fanaroff-Riley Classification". NASA/IPAC Extragalactic Database (NED). California Institute of Technology. Retrieved 24 March 2022.
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