Discovery of a z=4.93, X-ray selected quasar by the Chandra Multiwavelength Project (ChamP)

Details Discovery of a z=4.93, X-ray selected quasar by the Chandra Multiwavelength Project (ChamP) Discovery of a z=4.93, X-ray selected quasar by the Chandra Multiwavelength Project (ChamP)

2002-01-22

arxiv.org/abs/astro-ph/0201379v2

Astronomy and Astrophysics

Astrophysics

Published in ApJ Letters; 4 pages; 3 figures; http://hea-www.harvard.edu/CHAMP/

Scientific paper

10.1086/340458

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 an X-ray luminosity of L(X)=5.9x10^44 erg/s (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 unobscured X-ray luminosity function out to z~5.

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