Seyfert galaxies are one of the two largest groups of active galaxies, along with quasar host galaxies. They have quasar-like nuclei (very luminous sources...

emission in nearby Seyfert galaxies. In the 1960s and 1970s, early X-ray astronomy observations demonstrated that Seyfert galaxies and quasars are powerful...

quasars, their host galaxies are clearly detectable. Seen through a telescope, a Seyfert galaxy appears like an ordinary galaxy with a bright star superimposed...

Brunthaler, A.; et al. (2000). "III Zw 2, the first superluminal jet in a Seyfert galaxy". Astronomy & Astrophysics Letters. 357: 45. arXiv:astro-ph/0004256...

properties of being a quasar and a type 2 Seyfert galaxy, which is powered by a central supermassive black hole. The galaxy has an uncertain morphology. Based...

The Circinus Galaxy (ESO 97-G13) is a Seyfert galaxy in the constellation of Circinus. It is located 4 degrees below the Galactic plane, and, at a distance...

The Whirlpool Galaxy, also known as Messier 51a (M51a) or NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus...

of SABa, suggesting a weakly barred spiral galaxy with tightly wound arms. M64 is a type 2 Seyfert galaxy with an HII/LINER nucleus. The central region...

Pennsylvania Seyfert (crater), a crater on the far side of Earth's Moon that is named after Carl Keenan Seyfert Seyfert Galaxy, a class of galaxies named after...

described this galaxy as a star cluster. Today, however, the object is known to be a galaxy. It is one of the brightest Seyfert galaxies visible from Earth...

2 Seyfert galaxy, though its status as a Seyfert is questioned. It is possibly the closest Seyfert galaxy to Earth, and is the only known Seyfert in...

Fried Egg Galaxy is a face-on unbarred spiral galaxy in the constellation Pegasus. It is also classified as a Type II Seyfert Galaxy. The galaxy is unusual...

some spiral galaxies, which are named Seyfert galaxies after him. Seyfert's Sextet, a group of galaxies, is also named after him. Seyfert was born and...

double with γ1 Caeli; and HE0450-2958, a Seyfert galaxy that at first appeared as just a jet, with no host galaxy visible. Caelum was incepted as one of...

PKS 2004-447 is a narrow-line Seyfert 1 galaxy located in the constellation of Sagittarius. It has a redshift of (z) 0.24 and is the radio-loudest gamma...

ISBN 978-0-470-51180-0. Henkel, C.; et al. (2005). "New H2O masers in Seyfert and FIR bright galaxies". Astronomy and Astrophysics. 436 (1): 75–90. arXiv:astro-ph/0503070...

NGC 1275 (also known as Perseus A or Caldwell 24) is a type 1.5 Seyfert galaxy located around 237 million light-years away in the direction of the constellation...

LINER galaxy NGC 1291, a galaxy with an outer dust ring NGC 4725, a similar galaxy with an extended dust ring NGC 6027a, a member of Seyfert's Sextet...

the most well studied Seyfert galaxies. In 1943, this galaxy was one of six nebulae listed by American astronomer Carl K. Seyfert that showed broad emission...

dimensions, means that NGC 1386 is about 50,000 light years across. It is a Seyfert galaxy, the only one in Fornax Cluster. NGC 1386 was discovered by Johann Friedrich...

Canes Venatici. The nucleus of NGC 4395 is active and the galaxy is classified as a Seyfert Type I known for its very low-mass supermassive black hole...

Markarian 231 (UGC 8058) is a Type-1 Seyfert galaxy that was discovered in 1969 as part of a search of galaxies with strong ultraviolet radiation. It contains...

Herschel on September 30, 1834. It is an active galaxy with characteristics between a type I Seyfert galaxy and LINER. The nucleus of NGC 7213 features activity...

classified as a type 2 Seyfert galaxy in the optical, but observations in other wavelengths suggest it is type 1 Seyfert galaxy. The source of activity...

It is a Seyfert galaxy. The NGC 4253 is a barred galaxy with thick bar, while the arms form a ring. Marquez et al. suggested that the galaxy has a secondary...

NGC 4151 is an intermediate spiral Seyfert galaxy with weak inner ring structure located 15.8 megaparsecs (52 million light-years) from Earth in the constellation...

Tonantzintla S180) is a Seyfert galaxy located in the southern constellation of Cetus. It is located 827 million light years from Earth. The galaxy is classified...

as a Seyfert galaxy and a LINER undergoing starburst activity not only on the nucleus and the outer arms, but also across the bar of the galaxy, where...

262 (also known as Markarian 348) is a spiral galaxy in the cluster LGG 14. It is a Seyfert 2 spiral galaxy located 287 million light years away in the...

space agencies as hosting an active galactic nucleus, a quasar, and a Seyfert galaxy, each of which overlap in some way. Z 229-15 was first discovered by...