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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 searched for line emission in 86 quasars in the ASCA public archive. 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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