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

John D. Silverman, Paul J. Green, Dong Woo Kim, Belinda J. Wilkes, Robert A. Cameron, David Morris, Anil Dosaj, Chris Smith, Leopoldo Infante, Paul S. Smith, Buell Tomasson Jannuzi, Smita Mathur

Research output: Contribution to journalArticle

18 Citations (Scopus)

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 Lx = 5.9 × 1044 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 ∼5.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume569
Issue number1 II
DOIs
StatePublished - Apr 10 2002
Externally publishedYes

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quasars
x rays
luminosity
dropouts
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project

Keywords

  • Galaxies: active
  • Galaxies: nuclei
  • Quasars: general
  • Quasars: individual (CXOMP J213945.0-234655)
  • X-rays: general

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Silverman, J. D., Green, P. J., Kim, D. W., Wilkes, B. J., Cameron, R. A., Morris, D., ... Mathur, S. (2002). Discovery of a z = 4.93, X-ray-selected quasar by the Chandra Multiwavelength Project (ChaMP). Astrophysical Journal, 569(1 II). https://doi.org/10.1086/340458

Discovery of a z = 4.93, X-ray-selected quasar by the Chandra Multiwavelength Project (ChaMP). / Silverman, John D.; Green, Paul J.; Kim, Dong Woo; Wilkes, Belinda J.; Cameron, Robert A.; Morris, David; Dosaj, Anil; Smith, Chris; Infante, Leopoldo; Smith, Paul S.; Jannuzi, Buell Tomasson; Mathur, Smita.

In: Astrophysical Journal, Vol. 569, No. 1 II, 10.04.2002.

Research output: Contribution to journalArticle

Silverman, JD, Green, PJ, Kim, DW, Wilkes, BJ, Cameron, RA, Morris, D, Dosaj, A, Smith, C, Infante, L, Smith, PS, Jannuzi, BT & Mathur, S 2002, 'Discovery of a z = 4.93, X-ray-selected quasar by the Chandra Multiwavelength Project (ChaMP)', Astrophysical Journal, vol. 569, no. 1 II. https://doi.org/10.1086/340458
Silverman JD, Green PJ, Kim DW, Wilkes BJ, Cameron RA, Morris D et al. Discovery of a z = 4.93, X-ray-selected quasar by the Chandra Multiwavelength Project (ChaMP). Astrophysical Journal. 2002 Apr 10;569(1 II). https://doi.org/10.1086/340458
Silverman, John D. ; Green, Paul J. ; Kim, Dong Woo ; Wilkes, Belinda J. ; Cameron, Robert A. ; Morris, David ; Dosaj, Anil ; Smith, Chris ; Infante, Leopoldo ; Smith, Paul S. ; Jannuzi, Buell Tomasson ; Mathur, Smita. / Discovery of a z = 4.93, X-ray-selected quasar by the Chandra Multiwavelength Project (ChaMP). In: Astrophysical Journal. 2002 ; Vol. 569, No. 1 II.
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