Seyfert galaxies

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• Seyfert galaxy — Seyfert galaxies are a class of galaxies with nuclei that produce spectral line emission from highly ionized gascite book author=L. S. Sparke, J. S. Gallagher III year=2007 title=Galaxies in the Universe: An Introduction publisher=Cambridge… …   Wikipedia

• Seyfert galaxy — /suy feuhrt, see /, Astron. one of a group of spiral galaxies with compact, bright nuclei having characteristically broad emission lines suggestive of very hot gases in violent motion at the center. [1965 70; named after Carl K. Seyfert (1911 60) …   Universalium

• Seyfert , Carl Keenan — (1911–1960) American astronomer Seyfert was born in Cleveland, Ohio, and studied at Harvard where he graduated in 1933 and obtained his PhD in 1936. He worked at the McDonald Observatory in Texas from 1936 to 1940, the Mount Wilson Observatory in …   Scientists

• GALAXIES — L’observation à l’œil nu d’un ciel constellé d’étoiles montre que celles ci ne sont pas réparties au hasard: elles tendent à se regrouper en une longue écharpe laiteuse qui parcourt la voûte céleste d’un bord à l’autre de l’horizon, et que nos… …   Encyclopédie Universelle

• Seyfert galaxy — ☆ Seyfert galaxy [sē′fərt ] n. [after Carl K. Seyfert, U.S. astronomer who discovered them in the 1940s] any of a number of spiral galaxies with a small, intensely bright nucleus and a spectrum with strong, broad spectral lines …   English World dictionary

• Seyfert's Sextet — Galaxy cluster name = Seyfert s Sextet caption = A Hubble Space Telescope (HST) image of Seyfert s Sextet. Credit: HST/NASA/ESA. epoch=J2000 ra=RA|15|59|11.9cite web title=NASA/IPAC Extragalactic Database work=Results for HCG 79 url=http://nedwww …   Wikipedia

• Seyfert galaxy — noun Etymology: Carl K. Seyfert died 1960 American astronomer Date: 1959 any of a class of spiral galaxies that have small compact bright nuclei characterized by variability in light intensity, emission of radio waves, and spectra called also… …   New Collegiate Dictionary

• seyfert galaxy — ¦sēfə(r)t , ¦sī noun or seyfert ( s) Usage: usually capitalized S Etymology: after Carl K. Seyfert died 1960 American astronomer : any of a class of spiral galaxies that have small compact bright nuclei exhibiting variability in light intensity,… …   Useful english dictionary

• Seyfert galaxy — /ˈsaɪfət/ (say suyfuht) noun one of a number of galaxies with very bright nuclei. {named after Carl K Seyfert, US astronomer} …  

• Seyfert Galaxy —    Any of a class of spiral galaxies with a small, yet very active, nucleus. See Active Galactic Nucleus …   The writer's dictionary of science fiction, fantasy, horror and mythology

• Carl Keenan Seyfert — Carl Seyfert Naissance 11 février 1911 Cleveland (USA) Décès 13 juin 1960 (à 49 ans) Nashville (USA) Nationalité …   Wikipédia en Français