Spectral study of Narrow line Seyfert 1 Galaxies: Mrk478, UGC 11763, and EXO 1346.2+2645

Abderahmen Zoghbi, Institute of Astronomy, Cambridge

Narrow Line Seyfert 1 (NLS1) are thought to be accreting at rates close to Eddington. They are highly variable, and taken to be the perfect targets for understanding the accretion process. The X-ray spectra of three Narrow Line Seyfert 1, from the XMM archive have been analysed. They are well fitted with the relativistically blurred photoionized disc reflection model. The Spectrum of mrk478 seem not change over a year period despite the a big drop in the flux. UGC 11763 show a spectral drop around 7 keV similar to those seen in other NLS1, but has a remarkably hard spectrum (Gamma ~ 1.6).