X-Ray spectra of Seyfert 1 galaxies

M.V. CARDACI, M. SANTOS-LLEÓ, A.I. DÍAZ

Granada, España

Workshop; V Workshop Estallidos de Formación Estelar en Galaxias: Star Formation and Metallicity; 2007

We have analyse soft X-ray high resolution spectra (6 - 30 A) of a sample of four Seyfert 1 galaxies, HE1143-1810, Mkn110, CTSA08.12 and ESO359-G19, observed with the XMM-Newton satellite. In Spite of the objects selected were bright in the ROSAT observations when we observe them we obtain low count rate soft spectra. To investigate the nature of the emission of the nucleus, we fit the spectra with a sample of models. We found that the continuum of this sources can be modeled with a power law (modify by the absorption of the Galactic material). In three of the four cases we find an improvement in the continuum fit adding also a component of neutral material associated to the AGN. It is important to point out that we find no evidences of absorbing material partially ionised around these sources. The power law indexes found are in agreement to the ones found by Piconcelli et al. (2005) for this type of objects and could be indicating that these sources show a soft X-rays excess feature. Also the fluxes and luminosities found of same order than that found for the Seyfert 1 galaxies observed by ROSAT and ASCA. Only some emission lines are found to be statistically significants in fitting the spectra. But we couldn't use them to characterise the physical conditions of the emitting media due to the big errors in the line parameter determinations.