Narrow-line Seyfert 1 galaxies as an extreme of Seyfert activity

Details Narrow-line Seyfert 1 galaxies as an extreme of Seyfert activity Narrow-line Seyfert 1 galaxies as an extreme of Seyfert activity

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599...25b&link_type=abstract

X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G

Astronomy and Astrophysics

Astronomy

Active And Peculiar Galaxies And Related Systems, X-Ray Sources, X-Ray Bursts, Radio Galaxies

Scientific paper

The recent progress in the study of narrow-line Seyfert 1 galaxies is summarized. A clear correlation between the strength of the soft X-ray excess and the optical line width of the Hβ line is detected. A similar relation is detected between the hard 2-10 keV continuum slope and the Hβ line width. The most extreme X-ray variability in radio-quiet active galaxies is seen to date in narrow-line Seyfert 1 galaxies. These newly discovered observational properties give rise to requirements on their physical interpretation. The extreme X-ray variability in some narrow-line Seyfert 1 galaxies is probably due to relativistic effects. The extreme soft X-ray excess emission detected in narrow-line Seyfert 1 galaxies may be due to a more highly ionized accretion disk, with respect to broad line Seyfert 1 galaxies. Narrow-line Seyfert 1 galaxies are therefore thought to form an extreme of Seyfert activity. Because of their extreme properties, the study of narrow-line Seyfert 1 galaxies should allow us to progress in solving the diverse problems more generally posed by the Seyfert phenomenon. .

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