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It is one of a group now termed Seyfert galaxies.
In most respects Seyfert galaxies seem normal and are not unusually distant from us.
It is the brightest Seyfert galaxy and is of type 2.
At low luminosities, the objects to be unified are Seyfert galaxies.
He stayed until 1942, studying a class of active galaxies now called Seyfert galaxies.
This is a borderline, low-luminosity Seyfert galaxy with an active nucleus.
Our galaxy could become a Seyfert galaxy, exploding and killing everything."
It is this class of galaxies that is now known as Seyfert galaxies, in his honor.
It is also a Seyfert galaxy.
Maybe microuniverses, maybe dis- tant Seyfert galaxies in our own universe.
Some Seyfert galaxies show weak, small radio jets, but they are not radio-luminous enough to be classified as radio-loud.
Likewise Seyfert galaxies were suspected to be industrial accidents because their enormous and directed energy output had no initial explanation.
The galaxy is a Seyfert galaxy that emits bright X-rays.
Seyfert galaxies also show strong emission in the infrared, ultraviolet, and X-ray parts of the spectrum, whereas only less than 5% are radio loud.
About 50 million light-years from Earth, M77 is also a Seyfert galaxy and thus a bright object in the radio spectrum.
It is the second brightest Seyfert galaxy after NGC 1068.
One particular target was NGC 4151, the brightest Seyfert galaxy.
Seyfert galaxies.
He knew all about quasars and black holes and Seyfert galaxies, not to mention things like double stars and novae.
The exploding nuclei of galaxies such as the Seyfert galaxies (Figure 3) could be candidates for white holes.
NGC 5929 is a Seyfert galaxy in the constellation Boötes.
Seyfert galaxies are a class of galaxies with nuclei that produce spectral line emission from highly ionized gas.
It is the closest Seyfert galaxy to the Milky Way, and hosts an active galactic nucleus.
It is notable as a Seyfert galaxy with strong spectral emissions indicating ionized gases and a central supermassive black hole.
Members of this class of objects became known as Seyfert galaxies, and they were noted to have a higher than normal surface brightness in their nuclei.
Wörterbuch für Astronomie