2005A&A...433..455S -
Astronomy and Astrophysics, volume 433, 455-465 (2005/4-2)
The XMM-Newton view of three X-ray weak quasars: Iron emission and strong ionized absorption.
SCHARTEL N., RODRIGUEZ-PASCUAL P.M., SANTOS-LLEO M., CLAVEL J., GUAINAZZI M., JIMENEZ-BAILON E. and PICONCELLI E.
Abstract (from CDS):
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, N
H=2.9x10
22cm
–2 to N
H=1.9x10
23cm
–2, and ionization parameters, ξ=147erg.cm/s to ξ=542erg.cm/s. The spectra of PG 1535+547 require an additional partial covering by neutral material with a column density of N
H≃9x10
22cm
–2 at a covering factor of ≃0.96. The spectra of PG 1535+547 show systematic residuals in the energy range from ∼4keV to ∼6keV, which are inconsistent with K
α-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. (
2004A&A...414..107B) and Piconcelli et al. (
2004MNRAS.351..161P), 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 K
α 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.
Abstract Copyright:
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Journal keyword(s):
X-ray: galaxies - quasars: individual: PG 1001+054 - quasars: individual: PG 1535+547 - quasars: individual: PG 2112+059
Simbad objects:
6
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