This is an image of NGC 5128, also known as the Centaurus A. There is some
debate as to whether it is a lenticular or elliptical galaxy, as well as its
distance (10-16 million light years). One thing that is not in doubt is that
it is the constellation Centaurus. The center of the galaxy contains a
supermassive black hole with a mass equivalent to 55 million solar masses,
which ejects a relativistic jet that is responsible for emissions in the
X-ray and radio wavelengths. By taking radio observations of the jet
separated by a decade, astronomers have determined that the inner parts of
the jet are moving at about half of the speed of light.
Comments and suggestions welcomed.
See message header for info on list archives or unsubscribing, and please
send personal replies to the author, not the list.