In the widely accepted ‘unified model’1 solution of the classification puzzle of active galactic nuclei, the orientation of a dusty accretion torus around the central black hole dominates their appearance. In ‘type-1’ systems, the bright nucleus is visible at the centre of a face-on torus...
Classification Note: The galaxy has a well-defined core, with a very bright central region, and a considerably fainter outer region. Most elliptical galaxies have a smoother brightness gradient, hence my decision to add "pec" to its classification; Corwin essentially agrees, but points out that ...
The galaxy NGC 315 is an extended radio source within which there are many compact radio sources that form its intensity. Studies of this galaxy and its surroundings assume that although there are many sources in the NGC 315 immediate vicinity, in its wider 6° circumferences, there is a ...
Usage By The de Vaucouleurs Atlas: NGC 1300 is used by the de Vaucouleurs Atlas of Galaxies as an example of galaxy type SB(s)b. The classification type listed above is taken from the NED, and given the images below seems as reasonable as the de Vaucouleurs classification. Above, a 12...
Despite being about ten times smaller than the Milky Way Galaxy, NGC 1140 is producing new stars at about the same rate (about a million stars per million years), giving it an exceptionally bright nucleus and a classification as a Seyfert galaxy (type Sy 2). Above, a 12 arcmin wide ...
Vaucouleurs Atlas: NGC 6039/6042 is used by the de Vaucouleurs Atlas of Galaxies as an example of galaxy type E+1 (gE), the "gE" standing for giant elliptical, while the "+" sign indicates that the galaxy would be classified as E/S0 in the earlier Hubble-Shapley classification scheme...
for objects at such distances we should take into account the Universal expansion during the time it took their light to reach us. Doing that shows that the galaxy was just over 460 million light years away at the time the light by which we see it was emitted, about 470 million years ag...