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Additional
Radio galaxy
English Wikipedia - The Free Encyclopedia
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Radio galaxy
Radio galaxies
and their relatives, radio-loud
quasars
and
blazars
, are types of
active galaxy
that are very luminous at
radio wavelengths
, with luminosities up to 10
39
W
between 10 MHz and 100 GHz. 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
.
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