Presentation 1 : Oral
X-ray Spectrum of Super-Eddington Accretion Disk and Age of Supermassive Black Holes
Toshihiro KAWAGUCHI
Effects of electron scattering (opacity and Comptonization) on the emergent
X-ray spectrum from super-Eddington accretion flows (the so called slim
disks) are examined. The model is applied to Narrow-Line Seyfert 1 galaxies
(NLS1s) to estimate their accretion rates. We found that a NLS1, PG 1448+273, has an extremely large accretion rate: about 1000 L_Edd / c^2.
This implys that this object is really young: its inferred age (black-hole
mass divided by the accretion rate) is 10^6 years.