SIMBAD references

2005MNRAS.364..195P - Mon. Not. R. Astron. Soc., 364, 195-207 (2005/November-3)

XMM-Newton spectroscopy of high-redshift quasars.


Abstract (from CDS):

XMM-Newton observations of 29 high-redshift (z > 2) quasars, including seven radio-quiet, 16 radio-loud and six broad absorption line (BAL) objects, are presented; due to the high redshifts, the rest-frame energy bands extend up to ∼30-70 keV. Over 2-10 keV, the quasars can be well fitted in each case by a simple power law, with no strong evidence for iron emission lines. The lack of iron lines is in agreement both with dilution by the radio jet emission (for the radio-loud quasars) and the X-ray Baldwin effect. No Compton reflection humps at higher energies (i.e. above 10 keV in the rest frame) are detected either. Over the broad-band (0.3-10 keV), approximately half (nine out of 16) of the radio-loud quasars are intrinsically absorbed, with the values of NHgenerally being 1x1022 to 2x1022/cm2 in the rest frames of the objects. None of the seven radio-quiet objects shows excess absorption, while four of the six BAL quasars are absorbed. The radio-loud quasars have flatter continuum slopes than their radio-quiet counterparts (ΓRL∼ 1.55; ΓRQ∼ 1.98 over 2-10 keV), while, after modelling the absorption, the underlying photon index for the six BAL quasars is formally consistent with the non-BAL radio-quiet objects.

Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS

Journal keyword(s): galaxies: active - quasars: general - X-rays: galaxies

CDS comments: In Table B1 : Misprint for the redschift of Mrk 493.

Simbad objects: 87

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