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The XMM-Newton view of three X-ray weak quasars iron emission and strong ionized absorption

The XMM-Newton view of three X-ray weak quasars iron emission and strong ionized absorption

Publication date: 07 April 2005

Authors: Schartel, N., et al.

Journal: Astronomy & Astrophysics
Volume: 433
Page: 455
Year: 2005

Copyright: ESA

We present the analysis of XMM-Newton observations of three X-ray weak quasars: PG 1001+054, PG1535+547 and PG 2112+059. All objects are absorbed by ionized material showing high column densities, NH = 2.9 x 1022 cm-2 to NH = 1.9 x 1023 cm-2, and ionization parameters, xi = 147 erg cm s-1 to xi = 542 erg cm s-1. The spectra of PG1535+547 requires an additional partial covering by neutral material with a column density of NH approx 9 x 1022 cm-2 at a covering factor of approx 0.96. The spectra of PG1535+547 show systematic residuals in the energy range from sim 4 keV to sim 6 keV, which are inconsistent with Kalpha-fluorescence-emission of neutral or ionized iron under the assumption of a Gaussian line profile. They can be described with a relativistic disk line (Laor) and establish therefore the second X-ray weak quasar with such a spectral characteristic. Our results together with the findings of Brinkmann et al. (2004) and Piconcelli et al. (2004a), indicate that warm absorbers characterized by high column densities and ionization parameters are typical of X-ray weak quasars. The occurrence of a variable relativistic broad Fe Kalpha fluorescence line in two out of the five well studied X-ray weak quasars might indicate a second general characteristic of the entire object class. Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.

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