Seyfert galaxies are one of the two largest groups of active galaxies, along with
quasars. ... In 1943, Carl Keenan Seyfert discovered more galaxies similar to
NGC 1068 and ... It has been later not...
More recently, astronomers have discovered objects that fit none of Hubble's
categories, ... the spiral arms come from the ends of a bar through the nucleus
rather than from the nucleus itself. 4. ..... Some irregulars are seen to be pairs of
galaxies in collision. ... An active galaxy is a galaxy with an unusually luminous
Jun 2, 2007 ... When the universe was younger, some galaxies produced a lot ... A peculiar
group of galaxies are extremely luminous but very compact. ... an ``active galaxy''
to be a galaxy with a very luminous nucleus. ... Later, some other blue star-like
objects at large redshifts were discovered to have no radio emission ...
Interest in the M33 nucleus recently has been stimulated by the discovery that it
.... scaled-down versions of M3 l's nucleus, a luminous globular cluster, or some
.... have seen that globular clusters and some Local Group spiral-galaxy nuclei
are similar. ... The M31 nucleus, with a 190 km s~1, is clearly a dynamically
Some of the features of this revised scheme are subject to argument ... Finally,
astronomers have found that a few ellipticals do in fact have small numbers of
luminous O ... The normal spirals have arms that emanate from the nucleus, while
barred ...... It was discovered that galaxies and galaxy clusters tend to fall in
Many of the most luminous radio galaxies are morphologically classified as ... In
many cases these spectra are earlier in spectral type than normal spirals, ... Only
one `Seyfert 2 QSO' has been reported, E 0449-184, originally discovered as ....
definition of a very low-luminosity Seyfert 1.8 nucleus with unusually narrow lines
Jul 25, 2016 ... Discovered by John Herschel in 1835, NGC 3125 is a great ... Some of these
clumps of stars are notable — one of the most ..... But studies of the nearby
universe have turned up only a few of these unusual ..... This is demonstrated by
the striking face-on spiral galaxy NGC 6814, whose luminous nucleus ...
May 6, 2016 ... Discovered in 1784 by the German–British astronomer William ... NGC 4394 is
the archetypal barred spiral galaxy, with bright spiral arms ... The presence of
both tells us that stars have been forming in this galaxy throughout its history. .....
spiral galaxy NGC 6814, whose luminous nucleus and spectacular ...
Jul 21, 2016 ... But Hubble's powerful vision has carried us into the true "final frontier." ... Some
are distorted like a funhouse mirror through a "space warp" ... called a nuclear
ring, is extremely unusual in galaxies without a bar at their center, ...... face-on
spiral galaxy NGC 6814, whose luminous nucleus...
Some relation between galaxy and AGN properties might be expected, ... Seyfert
galaxies are, almost by definition, mostly in spirals and S0s (Simkin et al 1980 ...
A few dwarf systems (like the SMC or even fainter) have Seyfert nuclei, down to
.... that the brightest AGN come in unusually luminous galaxies, and the