Quasars (quasi-stellar objects) are objects of small angular size and
immense power output. These first quasars to be discovered were
strong radio sources. Because they are so bright,
quasars are some of the most distant objects we can see in the
Universe. The huge power output is believed to be fueled by
interactions between the central black hole and a surrounding "accretion
disk": a disk of matter that gathers around the black hole
in the galactic nucleus. Many of the images on these pages are Double Radio Sources
Associated with Galactic Nuclei (DRAGNs), which are large-scale double
radio sources produced by that
are launched by processes in AGN.
You can learn more about such sources at
.
Click any thumbnail below to view the details of
that image. Other images of Quasars can be found in the
.
