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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

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...

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...

3C 303 is a Seyfert galaxy with a quasar-like appearance located in the constellation Boötes. 3C 303 is also a radio galaxy It also contains an extragalactic...

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...

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...

direction) with respect to the stars. It is also classified as a Type II Seyfert Galaxy. Two supernova has been observed in NGC 7742: SN 1993R (type II, mag...

IC 4329A, also commonly referred as PGC 49051 is a Seyfert galaxy in the constellation of Centaurus. Its distance from Earth is 206 million light years...

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...

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...

galaxy merger located in the constellation Boötes. It is located 706 million light years from Earth. It is classified a double nucleus Seyfert galaxy...

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...

appearance Starburst galaxy – Galaxy undergoing an exceptionally high rate of star formation Seyfert galaxy – Class of active galaxies with very bright nuclei...

discovered by William Herschel on April 15, 1787. It is a Seyfert galaxy. NGC 5506 is a spiral galaxy seen edge-on, with dust lanes visible south of the nucleus...

the galaxy is estimated to be 2.56 ± 0.1 M☉ per year. The nucleus of the galaxy has been found to be active and it is categorised as a type 2 Seyfert galaxy...

megaparsecs). NGC 5643 has an active galactic nucleus and is a type II Seyfert galaxy. The galaxy was first discovered by James Dunlop on May 10, 1826, with his...

(EGRET) also aboard the Compton Gamma Ray Observatory. Seyfert galaxies are a class of galaxies with nuclei that produce spectral line emission from highly...