EDP Sciences
Free access
Issue
A&A
Volume 435, Number 2, May IV 2005
Page(s) 449 - 457
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20041623


A&A 435, 449-457 (2005)
DOI: 10.1051/0004-6361:20041623

The XMM-Newton view of PG quasars

II. Properties of the Fe K $\mathsf{_\alpha}$ line
E. Jiménez-Bailón, E. Piconcelli, M. Guainazzi, N. Schartel, P. M. Rodríguez-Pascual and M. Santos-Lleó

XMM-Newton Science Operation Center/RSSD-ESA, Apartado 50727, 28080 Madrid, Spain
    e-mail: ejimenez@xmm.vilspa.esa.es

(Received 8 July 2004 / Accepted 21 December 2004)

Abstract
The properties of the fluorescence Fe K$_\alpha$ emission lines of a sample of 38 quasars (QSOs) observed with XMM-Newton are studied. These objects are included in the optically selected sample from the Palomar-Green (PG) Bright Quasar Survey with an X-ray luminosity 1.3 $\times$ 1043 < $L_{2-10~{\rm keV}}$ < 5.1 $\times$ 1045 erg s-1 and z $\leq$ 1.72. For each object in the sample, we investigated the presence of both narrow and broad iron lines in detail. A total of 20 out of the 38 QSOs show evidence of an Fe K$_\alpha$ emission line with a narrow profile. The majority of the lines are consistent with an origin in low ionization material, which is likely to be located in the outer parts of the accretion disk, the molecular torus, and/or the Broad Line Region. The average properties of the narrow Fe K$_\alpha$ emission line observed in the sample are similar to those of Seyfert type galaxies as inferred from recent XMM-Newton and Chandra studies. A broad line has been significantly detected in only three objects. Furthermore, we studied the relationship between the equivalent width (EW) of the iron line and the hard band X-ray luminosity for radio quiet quasars. The analysis indicates that no clear correlation between the strength of the line and the hard X-ray luminosity is present, and our results do not show compelling evidence for an anticorrelation between these two quantities, i.e. the so-called X-ray Baldwin effect.


Key words: galaxies: active -- galaxies: nuclei -- quasar: general -- X-rays: galaxies

SIMBAD Objects



© ESO 2005

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