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XMM-Newton spectroscopy of high-redshift quasars

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posted on 2012-10-24, 09:22 authored by Kim L. Page, J. N. Reeves, Paul T. O'Brien, Martin J. L. Turner
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 N[subscript H] generally being 1 × 10²² to 2 × 10²² cm[superscript -]² 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 (Γ[subscript RL] ∼ 1.55; Γ[subscript RQ] ∼ 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.

History

Citation

Monthly Notices of the Royal Astronomical Society, 2005, 364 (1), pp. 195-207

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP) on behalf of the Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Copyright date

2005

Available date

2012-10-24

Publisher version

http://mnras.oxfordjournals.org/content/364/1/195

Language

en

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