Toshihiro Kawaguchi (National Astronomical Observatory of Japan)
We discuss a couple of physics (electron scatterings and self-gravity) that become important when the mass accretion rate onto the central black hole exceeds the Eddington rate. Then, theoretical modeling of broad-band (optical to X-ray) spectral energy distribution of narrow-line Seyfert 1 galaxies (NLS1s) will be presented, together with our XMM observation on the object of possibly highest Eddington ratio. Growth of black hole masses in the super-Eddington accretion phase will be shortly discussed. We also briefly mention outflow phenomena seen in [O III] emission lines of NLS1s, along with our KPNO observations on NLS1s with largest outflow velocity.