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T. Yaqoob, S. Zobair, I. M. George, T. J. Turner, K. Nandra, P. J. Serlemitsos (LHEA, NASA/GSFC)
X-ray emission lines in high luminosity quasars are uncommon. We report the discovery of unusual emission lines in the X-ray spectra of the high-redshift quasars PKS 0637-752 and PKS 2149-306 (at 1.6 keV and 17 keV in the quasar frame respectively). The lines do not have any immediate identification but if they are due to OVIII in PKS 0637-752 and Fe-K in PKS 2149 then the Doppler factors for both quasars are similar, implying relativistic bulk motion of the order of 0.75c.
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