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The Circinus Galaxy, a Type II Seyfert galaxy. 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 of electromagnetic radiation that are outside of our own galaxy) with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, [1] but unlike quasars, their ...
The galaxy has a bar and two weak spiral arms which form a ring. [4] [5] The nucleus of NGC 7682 has been found to be active and has been categorised as a type 2 Seyfert galaxy. [6] The most accepted theory for the energy source of Seyfert galaxies is the presence of an accretion disk around a supermassive black hole.
The characteristics of Seyfert galaxies were first observed in M77 in 1908; however, Seyferts were defined as a class in 1943. [23] First radio galaxy: Cygnus A: Cygnus: 1951 Of several items, then called radio stars, Cygnus A was identified with a distant galaxy, being the first of many radio stars to become a radio galaxy. [24] [25] First ...
NGC 3147 has been characterised as a Seyfert II galaxy. It is considered the best candidate to be a true type II Seyfert galaxy, [4] galaxies which feature optical/UV spectrum lacking broad emission lines due to the lack of the broad line region rather than its obscuration, since the nucleus is simultaneously seen unobscured in the X-rays.
Seyfert's Sextet is a group of galaxies about 190 million light-years away [2] in the constellation Serpens. The group appears to contain six members, but one of the galaxies, NGC 6027d , is a background object (700 million light years behind the group) and another "galaxy," NGC 6027e , is actually a part of the tail from galaxy NGC 6027 .
NGC 4395 is a nearby low surface brightness spiral galaxy located about 14 million light-years (or 4.3 Mpc) from Earth in the constellation Canes Venatici. [1] 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.
Second, this galaxy has an active nucleus. This caused Carl Seyfert in 1943 to include it in his list of galaxies, which are now called Seyfert Galaxies. However, NGC 3077, though an emission line galaxy, is today no longer classified as a Seyfert galaxy. NGC 3077 was discovered by William Herschel on November 8, 1801. He remarked that "On the ...
NGC 3081 is a barred lenticular ring galaxy in the constellation of Hydra. NGC 3081 is located about 85 million light-years away from Earth, which means, given its apparent dimensions, that NGC 3081 is approximately 60,000 light-years across. It is a type II Seyfert galaxy, characterised by its bright nucleus.