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- Seyfert_galaxy abstract "Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars. They have quasar-like nuclei (very luminous, distant and bright sources of electromagnetic radiation) with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, their host galaxies are clearly detectable.Seyfert galaxies account for about 10% of all galaxies and are some of the most intensely studied objects in astronomy, as they are thought to be powered by the same phenomena that occur in quasars, although they are closer and less luminous than quasars. These galaxies have supermassive black holes at their centres which are surrounded by accretion discs of in-falling material. The accretion discs are believed to be the source of the observed ultraviolet radiation. Ultraviolet emission and absorption lines provide the best diagnostics for the composition of the surrounding material.Seen in visible light, most Seyfert galaxies look like normal spiral galaxies, but when studied under other wavelengths, it becomes clear that the luminosity of their cores is of comparable intensity to the luminosity of whole galaxies the size of the Milky Way.Seyfert galaxies are named after Carl Seyfert, who first described this class in 1943.".
- Seyfert_galaxy thumbnail Circinus.galaxy.750pix.jpg?width=300.
- Seyfert_galaxy wikiPageExternalLink active_galaxies.html.
- Seyfert_galaxy wikiPageExternalLink seyferts.html.
- Seyfert_galaxy wikiPageExternalLink level2a.php?p=0&cat=5&subcat=3.
- Seyfert_galaxy wikiPageID "206919".
- Seyfert_galaxy wikiPageRevisionID "606581933".
- Seyfert_galaxy hasPhotoCollection Seyfert_galaxy.
- Seyfert_galaxy subject Category:Active_galaxy_types.
- Seyfert_galaxy subject Category:Seyfert_galaxies.
- Seyfert_galaxy type Abstraction100002137.
- Seyfert_galaxy type Collection107951464.
- Seyfert_galaxy type Galaxy108270938.
- Seyfert_galaxy type Group100031264.
- Seyfert_galaxy type SeyfertGalaxies.
- Seyfert_galaxy comment "Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars.".
- Seyfert_galaxy label "Galaktyka Seyferta".
- Seyfert_galaxy label "Galassia di Seyfert".
- Seyfert_galaxy label "Galaxia Seyfert".
- Seyfert_galaxy label "Galaxie de Seyfert".
- Seyfert_galaxy label "Galáxia Seyfert".
- Seyfert_galaxy label "Seyfert galaxy".
- Seyfert_galaxy label "Seyfert-stelsel".
- Seyfert_galaxy label "Seyfertgalaxie".
- Seyfert_galaxy label "Сейфертовская галактика".
- Seyfert_galaxy label "مجرة زايفرت".
- Seyfert_galaxy label "セイファート銀河".
- Seyfert_galaxy label "西佛星系".
- Seyfert_galaxy sameAs Seyfertgalaxie.
- Seyfert_galaxy sameAs Γαλαξίες_Σίφερτ.
- Seyfert_galaxy sameAs Galaxia_Seyfert.
- Seyfert_galaxy sameAs Seyfert_galaxia.
- Seyfert_galaxy sameAs Galaxie_de_Seyfert.
- Seyfert_galaxy sameAs Galassia_di_Seyfert.
- Seyfert_galaxy sameAs セイファート銀河.
- Seyfert_galaxy sameAs 세이퍼트_은하.
- Seyfert_galaxy sameAs Seyfert-stelsel.
- Seyfert_galaxy sameAs Galaktyka_Seyferta.
- Seyfert_galaxy sameAs Galáxia_Seyfert.
- Seyfert_galaxy sameAs m.01dcdg.
- Seyfert_galaxy sameAs Q213930.
- Seyfert_galaxy sameAs Q213930.
- Seyfert_galaxy sameAs Seyfert_galaxy.
- Seyfert_galaxy wasDerivedFrom Seyfert_galaxy?oldid=606581933.
- Seyfert_galaxy depiction Circinus.galaxy.750pix.jpg.
- Seyfert_galaxy isPrimaryTopicOf Seyfert_galaxy.
