Discovery of A <i>z</i>=4.93, X-ray-selected quasar by the <i>Chandra</i> multiwavelength project (chaMP)
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Date
2002
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Abstract
We present X-ray and optical observations of CXOMP J213945.0-234655, a high-redshift (z = 4.93) quasar discovered through the Chandra Multiwavelength Project (ChaMP). This object is the most distant X-ray-selected quasar published, with a rest-frame X-ray luminosity of L-x = 5.9 x 10(44) ergs s(-1) (measured in the 0.3-2.5 keV band and corrected for Galactic absorption). CXOMP J213945.0-234655 is a g' dropout object (>26.2), with r' = 22.87 and i' = 21.36. The rest- frame X-ray-to-optical flux ratio is similar to quasars at lower redshifts and slightly X-ray bright relative to z > 4 optically selected quasars observed with Chandra. The ChaMP is beginning to acquire significant numbers of high-redshift quasars to investigate the X-ray luminosity function out to. z similar to 5.
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galaxies : active, galaxies : nuclei, quasars : general, quasars : individual (CXOMP J213945.0-234655), X-rays : general