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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@article{54c7850b69084eaaab1321879bc92dfb,

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)",

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journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

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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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U2 - 10.1086/340458

DO - 10.1086/340458

M3 - Article

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SN - 0004-637X

VL - 569

SP - L1-L4

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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