Characterization of the emitting and absorbing media around the nucleus of the active galaxy UGC 11763 using XMM-Newton data

¹ Universidad Autónoma de Madrid, Ctra. de Colmenar Km.15, Cantoblanco, 28049 Madrid, Spain
² XMM-Newton Science Operations Center, ESAC, ESA, POB 78, 28691 Villanueva de la Cañada, Madrid, Spain e-mail: Monica.Cardaci@sciops.esa.int
³ Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, 04510 México DF, México
⁴ Facultad de Cs. Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina

Received: 20 January 2009
Accepted: 11 July 2009

Abstract

Aims. The detailed analysis of all data taken by the XMM-Newton satellite of UGC 11763 to characterize the different components that are emitting and absorbing radiation in the vicinity of the active nucleus.

Methods. The continuum emission was studied through the EPIC spectra taking profit of the spectral range of these cameras. The high resolution RGS spectra were analyzed in order to characterize the absorbing features and the emission line features that arise in the spectra of this source.

Results. A power law with a photon index accounts for the continuum emission of this source in the hard X-rays from 10 down to 1 keV. At lower energies, a black body model with  keV provides a good description of the observed soft excess. The absorption signatures in the spectra of UGC 11763 are consistent with the presence of a two phase ionized material ( and ;  cm^-2, respectively) in the line of sight. The physical conditions found are consistent with the two phases being in pressure equilibrium. The low ionization component is more ionized than typically found for warm absorbers in other Seyfert 1 galaxies. There are also signatures of some emission lines: Ovii Heα(r), Ovii Heα(f), a blend of the Neix Heα triplet and Fexviii at  Å.