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

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

a r X i v : a s t r o - p h / 0 2 0 1 3 7 9 v 2 5 A p r 2 0 0 2 Discovery of a z=4.93, X-ray selected quasar by the Chandra Multiwavelength Project (ChamP) John D. Silverman1,2,3, Paul J. Green, Dong-Woo Kim, Belinda J. Wilkes, Robert A. Cameron, David Morris, Anil Dosaj2 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 Chris Smith Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile Leopoldo Infante4 Departamento de Astronom??a y Astrof??sica, P. Universidad Cato?lica, Casilla 306, Santiago, Chile Paul S. Smith Steward Observatory, The University of Arizona, Tucson, AZ 85721 Buell T. Jannuzi National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ, 85726-6732 Smita Mathur Astronomy Department, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 ABSTRACT 1Astronomy Department, University of Virginia, P.O. Box 3818, Charlottesville, VA, 22903-0818 2Visiting Astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observa- tory, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation. 3email: jds@ 4Visiting astronomer, ESO New Technology Telescope – 2 – We present X-ray and optical observations of CXOMPJ213945.0-234655, a high redshift (z = 4.93) quasar discovered through the Chandra Multiwavelength Project (ChaMP). This object is the most distant X-ray selected quasar pub- lished, with a rest-frame X-ray luminosity of LX = 5.9×10 44 erg s?1 (measured in the 0.3–2.5 keV band and corrected for Galactic absorption). CXOMPJ213945.0- 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