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NGC 4395
- NGC 4395 is the least luminous and nearest Seyfert galaxy known, located eight million light-years away in the direction of the constellation Canes Venatici (The Hunting Dogs).
esahubble.org/images/opo9319a/
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Centaurus A or NGC 5128, apparently the brightest Seyfert galaxy as seen from Earth; a giant elliptical galaxy and also classified as a radio galaxy notable for its relativistic jet spanning more than a million light years in length
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NGC 185 has an active galactic nucleus (AGN) and is usually classified as a type 2 Seyfert galaxy, [7] though its status as a Seyfert is questioned. [8] It is possibly the closest Seyfert galaxy to Earth, and is the only known Seyfert in the Local Group.
The optical spectrum of the Seyfert 2 galaxy NGC 1667 is shown, with important emission lines identified (Ho, Filippenko, and Sargent 1993). Some strong absorption lines that arise in the host galaxy rather than the AGN itself are also identified.
Two Kinds of Seyfert Galaxies. The thousand or so Seyfert galaxies that are now known can be subclassified into two groups, Seyfert 1 galaxies and Seyfert 2 galaxies (these are also termed type 1 and type 2 Seyferts, respectively). These classifications have the following characteristics.
3.2 Seyfert galaxies In 1943 the American astronomer Carl Seyfert (1911-1960) drew attention to a handful of spiral galaxies that had unusually bright point-like nuclei. Figure 12 shows NGC 4051, one of the first Seyfert galaxies to be identified.
Seyfert galaxy, any of a class of galaxies known to have active nuclei. Such galaxies were named for the American astronomer Carl K. Seyfert, who first called attention to them in 1944. Two types are recognized. The nuclear spectra of Type 1 Seyfert galaxies show broad emission lines, which are.
