Slim Disk Model for Narrow-Line Seyfert 1 Galaxies
Abstract
We argue that both the extreme soft X-ray excess and the large-amplitude variability of Narrow-Line Seyfert 1 galaxies (NLS1s) can be explained in the framework of the slim disk model. When the disk luminosity approaches the Eddington luminosity, the disk becomes a slim disk, exhibiting a multi-color blackbody spectrum with a maximum temperature, T(bb), of about 0.2 (M/1e5 solar masses)e(-1/4) keV, and size of the X-ray emitting region, r(bb), of about R(S) (the Schwarzschild radius). Furthermore, magnetic energy can be amplified up to a level exceeding radiation energy emitted from the disk, causing substantial variability in X-rays by consecutive magnetic flares.
Cite
@article{arxiv.astro-ph/0005133,
title = {Slim Disk Model for Narrow-Line Seyfert 1 Galaxies},
author = {Shin Mineshige and Mitsuru Takeuchi},
journal= {arXiv preprint arXiv:astro-ph/0005133},
year = {2009}
}
Comments
Contributed talk presented at the Joint MPE,AIP,ESO workshop on NLS1s, Bad Honnef, Dec. 1999, to appear in New Astronomy Reviews; also available at http://wave.xray.mpe.mpg.de/conferences/nls1-workshop