Nothing special - Just like most large galaxies, they are thought to have a super massive black hole at the centre of the galaxy.
A supermassive black hole.
At the center of a large cluster, you'll usually find large and massive galaxies.
The nearest cluster of galaxies is the "Virgo Cluster" discovered by Charles Messier in 1784. The Virgo cluster lies at/near the center of the Supercluster we belong to - also called the "Virgo Supercluster". Our "Local Group" (comprising of The Milky way, Andromeda, and another 25-30 smaller galaxies) is part of the Virgo Cluster. The center of the Virgo cluster is at a distance of about 18 Mpc (Mega parsecs) approx 60 Million lightyears from us [which translates to a 'redshift' of only z=0.004]. Ain't the universe huge? Note: There are quite a few 'groups of galaxies' between us and the center of Virgo Cluster.
Elliptical galaxies are large blob shaped galaxies that most galaxies will eventually look like. Elliptical galaxies are what happens when two or more large galaxies collide and coalesce.
They are simply called "galaxies which are part of a cluster".
While spiral galaxies are bright, elliptical galaxies are dim. Spiral galaxies are hotbeds of star formation, but elliptical galaxies aren't nearly as prolific because they contain less gas and dust, which means fewer new (and brighter) stars are born
It is not correct to talk about "the" Seyfert galaxy - Seyfert galaxies are a type of galaxy.
Alan Thomas Koski has written: 'Spectrophotometry of Seyfert 2 galaxies and narrow-line radio galaxies'
T. J. Turner has written: 'PSPC soft x-ray observations of Seyfert 2 galaxies' -- subject(s): Seyfert galaxies, X ray astronomy, X ray binaries, X ray spectra
* M15 - a globular cluster near the nose of Pegasus. * NGC 7742 - a Type 2 Seyfert galaxy.
Tim Seyfert's birth name is Timothy Dean Seyfert.
Tim Seyfert is 6' 4".
At the center of a large cluster, you'll usually find large and massive galaxies.
Carl Keenan Seyfert was born in 1911.
Michael Seyfert has written: 'Im Niemandsland'
Carl Keenan Seyfert died in 1960.
Johann Caspar Seyfert died in 1767.
Gabriele Seyfert was born on 1948-11-23.