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

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 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.

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

References in corpus (11)

• A Survey of z>5.8 Quasars in the Sloan Digital Sky Survey I: Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6
• Evidence for Reionization at z ~ 6: Detection of a Gunn-Peterson Trough in a z=6.28 Quasar
• A Wavelet-Based Algorithm for the Spatial Analysis of Poisson Data
• Chandra X-Ray Observatory (CXO):Overview
• The Opacity of the Lyman Alpha Forest and Implications for Omega_{baryon} and the Ionizing Background
• The Chandra Deep Field North Survey. V. 1 Ms Source Catalogs
• High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data VI. Sloan Digital Sky Survey Spectrograph Observations
• Fitting the spectrum of the X-ray background: the effects of high metallicity absorption
• Exploratory Chandra Observations of the Highest-Redshift Quasars: X-rays from the Dawn of the Modern Universe
• An XMM-Newton detection of the z=5.80 X-ray weak quasar SDSSp J104433.04-012502.2
• The X-ray Properties of z>4 Quasars

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• X-ray lighthouses of the high-redshift Universe. Probing the most luminous z>4 Palomar Digital Sky Survey Quasars with Chandra
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release Six to Nine
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• XMM-Newton Observations of High Redshift Quasars
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• Chandra Detection of Highest Redshift (z~6) Quasars in X-rays
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