Ultrasoft narrow-line Seyfert 1s: At the extremes of Seyfert accretion?

Details Ultrasoft narrow-line Seyfert 1s: At the extremes of Seyfert accretion? Ultrasoft narrow-line Seyfert 1s: At the extremes of Seyfert accretion?

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..431..191b&link_type=abstract

Accretion processes in astrophysical systems: Some like it hot! - eigth astrophysics conference. AIP Conference Proceedings, Vo

Astronomy and Astrophysics

Astrophysics

4

Active And Peculiar Galaxies And Related Systems, Infall, Accretion, And Accretion Disks, X-Ray

Scientific paper

We briefly describe some of the recent X-ray results on ultrasoft narrow-line Seyfert 1 galaxies. These galaxies have strong and hot soft X-ray excess components, and many of them show extremely rapid, large-amplitude and nonlinear X-ray variability. They lie toward one extreme of the Boroson & Green (1992) primary eigenvector, suggesting that they have extremal values of a primary physical parameter such as the fraction of the Eddington rate at which the supermassive black hole is accreting. We provide an update of the results on the >2 keV X-ray continua of these galaxies.

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