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 T. Jannuzi; Smita Mathur

doi:10.1086/340458

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 T. Jannuzi, Smita Mathur

Steward Observatory

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

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 × 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 language	English (US)
Pages (from-to)	L1-L4
Journal	Astrophysical Journal
Volume	569
Issue number	1 II
DOIs	https://doi.org/10.1086/340458
State	Published - Apr 10 2002

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/340458

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title = "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 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.",

keywords = "Galaxies: active, Galaxies: nuclei, Quasars: general, Quasars: individual (CXOMP J213945.0-234655), X-rays: general",

author = "Silverman, {John D.} and Green, {Paul J.} and Kim, {Dong Woo} and Wilkes, {Belinda J.} and Cameron, {Robert A.} and David Morris and Anil Dosaj and Chris Smith and Leopoldo Infante and Smith, {Paul S.} and Jannuzi, {Buell T.} and Smita Mathur",

year = "2002",

month = apr,

day = "10",

doi = "10.1086/340458",

language = "English (US)",

volume = "569",

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journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

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TY - JOUR

T1 - Discovery of a z = 4.93, X-ray-selected quasar by the Chandra Multiwavelength Project (ChaMP)

AU - Silverman, John D.

AU - Green, Paul J.

AU - Kim, Dong Woo

AU - Wilkes, Belinda J.

AU - Cameron, Robert A.

AU - Morris, David

AU - Dosaj, Anil

AU - Smith, Chris

AU - Infante, Leopoldo

AU - Smith, Paul S.

AU - Jannuzi, Buell T.

AU - Mathur, Smita

PY - 2002/4/10

Y1 - 2002/4/10

N2 - 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.

AB - 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.

KW - Galaxies: active

KW - Galaxies: nuclei

KW - Quasars: general

KW - Quasars: individual (CXOMP J213945.0-234655)

KW - X-rays: general

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

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