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Seyfert galaxy

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Seyfert galaxy NGC 7319[1]

The Seyfert galaxies are galaxies which features having a bright central stellar core point, around 1036 to 1038 W, and a spectrum showing emission lines[2] that are of high ionization.[3] The Seyfert galaxies are named after Carl Seyfert, who discovered them in 1943.

Types

Based on its spectrum, Seyfert galaxies are classified as type 1 or 2. Galaxies of type 1 has both lines allowed as H, He I and He II and narrower forbidden lines as for instance O III.[4] In type 1 permitted lines are much broader than the forbidden lines (equivalent to a velocity of 104 km/s−1 ) whereas type 2 are similar and narrower (< 103 km/s−1).[2] Seyferts galaxies of type 1 have spectra very similar to quasars.[3]

References

  1. "The Radio Emission of the Seyfert Galaxy NGC 7319". Cornel University Library. http://arxiv.org/abs/astro-ph/9812365. 
  2. 2.0 2.1 Karttunen, H.; Kröger, P.; Oja, H.; Poutanen M.; Donner, K. J, ed. (2003). Fundamental Astronomy (5th ed.). Berlin, Heidelberg, New York: Springer. p. 385. ISBN 978-3-540-34143-7. 
  3. 3.0 3.1 Moore, Sir Patrick, ed. (2002). Philip's Astronomy Encyclopedia (1ª ed.). London: Octopus Publishing Group. p. 363. ISBN 0-540-07863-8. 
  4. Carrol, Bradley W.; Ostlie, Dale A. (2006). An Introduction to Modern Astrophysics (2nd ed.). Addison-Wesley. p. 1085. ISBN 978-0-80530402-2.