Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.0212y&link_type=abstract
American Astronomical Society, HEAD meeting #4, #02.12; Bulletin of the American Astronomical Society, Vol. 31, p.698
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
George Ian Michael
Nandra Kirpal
Serlemitsos Peter J.
Turner Tracey Jane
Yaqoob Tahir
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