Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...433..455s&link_type=abstract
Astronomy and Astrophysics, Volume 433, Issue 2, April II 2005, pp.455-465
Astronomy and Astrophysics
Astrophysics
16
X-Ray: Galaxies, Quasars: Individual:, Pg 1001+054, Quasars: Individual: Pg 1535+547, Quasars: Individual: Pg 2112+059
Scientific paper
We present the analysis of XMM-Newton observations of three X-ray weak quasars: PG 1001+054, PG 1535+547 and PG 2112+059. All objects are absorbed by ionized material showing high column densities, NH = 2.9 × 1022~cm-2 to NH = 1.9 × 1023~cm-2, and ionization parameters, ξ = 147 ~erg cm s-1 to ξ = 542 erg cm s-1. The spectra of PG 1535+547 require an additional partial covering by neutral material with a column density of NH ≈ 9 × 1022 ~cm-2 at a covering factor of ≈ 0.96. The spectra of PG 1535+547 show systematic residuals in the energy range from ~4 keV to ~6 keV, which are inconsistent with Kα-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. ([CITE], A&A, 414, 107) and Piconcelli et al. ([CITE], MNRAS, 351, 161), 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 Kα 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.
Clavel Jean
Guainazzi Matteo
Jimenez-Bailon Elena
Piconcelli Enrico
Rodriguez-Pascual Pedro M.
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