The Nature of the Emission Components in the Quasar/NLS1 PG 1211+143

We present the study of the emission properties of the quasar PG1211+143,which belongs to the class of Narrow Line Seyfert 1 galaxies. On the basis ofobservational data analyzed by us and collected from the literature, we studythe temporal and spectral variability of the source in the optical/UV/X-raybands and we propose a model that explains the spectrum emitted in this broadenergy range. In this model, the intrinsic emission originating in the warmskin of the accretion disk is responsible for the spectral component that isdominant in the softest X-ray range. The shape of reflected spectrum as well asFe K line detected in hard X-rays require the reflecting medium to be mildlyionized (xi~500). We identify this reflector with the warm skin of the disk andwe show that the heating of the skin is consistent with the classical alphaP_{tot} prescription, while alpha P_{gas} option is at least two orders ofmagnitude too low to provide the required heating. We find that the mass of thecentral black hole is relatively small (M_BH~10^7- 10^8 Msun, which isconsistent with the Broad Line Region mapping results and characteristic forNLS1 class.Comment: 22 pages, 10 figures, accepted to Ap