Characterization of the emitting and absorbing media around the nucleus of the NLS1 galaxy UGC11763 using XMM-Newton data

M.V. CARDACI; M. SANTOS-LLEÓ; Y. KRONGOLD; G.F. HÄGELE; A.I. DÍAZ; P. RODRÍGUEZ-PASCUAL

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Año: 2009 vol. 505 p. 541 - 551

0004-6361

Aims. The detailed analysis of all data taken by the XMM-Newton satellite of UGC11763 to characterize the different componentsthat 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. Thehigh resolution RGS spectra were analyzed in order to characterize the absorbing features and the emission line features that arise inthe spectra of this source.Results. A power law with a photon index Γ = 1.72+0.03−0.01 accounts for the continuum emission of this source in the hard X-rays from10 down to 1 keV. At lower energies, a black body model with kT = 0.100 ± 0.003 keV provides a good description of the observedsoft excess. The absorption signatures in the spectra of UGC11763 are consistent with the presence of a two phase ionized material(logU = 1.65+0.07−0.08; 2.6 ± 0.1 and logNH = 21.2 ± 0.2; 21.51 ± 0.01 cm−2, respectively) in the line of sight. The physical conditionsfound are consistent with the two phases being in pressure equilibrium. The low ionization component is more ionized than typicallyfound for warm absorbers in other Seyfert 1 galaxies. There are also signatures of some emission lines: Ovii Heα(r), Ovii Heα(f), ablend of the Neix Heα triplet and Fexviii at λ 17.5Å.