Triangulum is classified as unbarred, but an analysis of the galaxy shape shows what may be a weak bar-like structure about the galactic nucleus.
32.
The " A " is assigned when the galactic nucleus lacks a bar-shaped structure, in contrast to " SB " class barred spiral galaxies.
33.
See active galactic nucleus for the general article on the bright centers of galaxies .-- 140.247.240.131 14 : 45, 14 June 2007 ( UTC)
34.
Slightly fainter is NGC 5921, a barred spiral galaxy with a LINER-type active galactic nucleus situated somewhat closer at a distance of 21 megaparsecs.
35.
The bright nucleus indicates the presence of an active galactic nucleus-a galaxy with a supermassive black hole at the center, accreting matter from the bar.
36.
A third possibility is that the halo formation was truncated as a result of early feedback from the active galactic nucleus at the core of M87.
37.
It has a heterogeneous halo of extremely hot gas, posited to be due to the active galactic nucleus at the core of the central elliptical galaxy.
38.
The central cD galaxy of the cluster hosts an active galactic nucleus, which is powered by a central supermassive black hole like those of other galaxies.
39.
This assumes the quasar is radiating energy in all directions, but the active galactic nucleus is believed to be radiating preferentially in the direction of its jet.
40.
An active galactic nucleus ( AGN ) is a compact region at the center of a galaxy that has a higher than normal luminosity over portions of the electromagnetic spectrum.
