The extreme X-ray luminosity of the z = 4.72 radio-loud quasar GB 1428+4217

A. C. Fabian; W. N. Brandt; R. G. McMahon; I. M. Hook

doi:10.1093/mnras/291.1.l5

The extreme X-ray luminosity of the z = 4.72 radio-loud quasar GB 1428+4217

A. C. Fabian
, W. N. Brandt
, R. G. McMahon
, I. M. Hook

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

30 Scopus citations

Abstract

We report on a ROSAT High Resolution Imager observation of the radio-loud quasar GB 1428+4217, which is at a redshift z = 4.72. The quasar was well detected, with a flux in the observed 0.1-2.4 keV band of ∼10^-12 erg cm^-2 s^-1. Our result confirms that the object in the catalogue of serendipitous X-ray sources, WGACAT, is indeed the quasar. GB 1428+4217 is therefore the brightest X-ray source above a redshift of 4 and has an extremely high isotropic X-ray luminosity, which exceeds that in other (observed) bands. The observed spectral energy distribution of the object therefore peaks at X-ray, or even shorter, wavelengths. We speculate that the emission in the object is beamed toward us.

Original language	English (US)
Pages (from-to)	L5-L7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	291
Issue number	1
DOIs	https://doi.org/10.1093/mnras/291.1.l5
State	Published - 1997

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/291.1.l5

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title = "The extreme X-ray luminosity of the z = 4.72 radio-loud quasar GB 1428+4217",

abstract = "We report on a ROSAT High Resolution Imager observation of the radio-loud quasar GB 1428+4217, which is at a redshift z = 4.72. The quasar was well detected, with a flux in the observed 0.1-2.4 keV band of ∼10-12 erg cm-2 s-1. Our result confirms that the object in the catalogue of serendipitous X-ray sources, WGACAT, is indeed the quasar. GB 1428+4217 is therefore the brightest X-ray source above a redshift of 4 and has an extremely high isotropic X-ray luminosity, which exceeds that in other (observed) bands. The observed spectral energy distribution of the object therefore peaks at X-ray, or even shorter, wavelengths. We speculate that the emission in the object is beamed toward us.",

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T1 - The extreme X-ray luminosity of the z = 4.72 radio-loud quasar GB 1428+4217

AU - Fabian, A. C.

AU - Brandt, W. N.

AU - McMahon, R. G.

AU - Hook, I. M.

PY - 1997

Y1 - 1997

N2 - We report on a ROSAT High Resolution Imager observation of the radio-loud quasar GB 1428+4217, which is at a redshift z = 4.72. The quasar was well detected, with a flux in the observed 0.1-2.4 keV band of ∼10-12 erg cm-2 s-1. Our result confirms that the object in the catalogue of serendipitous X-ray sources, WGACAT, is indeed the quasar. GB 1428+4217 is therefore the brightest X-ray source above a redshift of 4 and has an extremely high isotropic X-ray luminosity, which exceeds that in other (observed) bands. The observed spectral energy distribution of the object therefore peaks at X-ray, or even shorter, wavelengths. We speculate that the emission in the object is beamed toward us.

AB - We report on a ROSAT High Resolution Imager observation of the radio-loud quasar GB 1428+4217, which is at a redshift z = 4.72. The quasar was well detected, with a flux in the observed 0.1-2.4 keV band of ∼10-12 erg cm-2 s-1. Our result confirms that the object in the catalogue of serendipitous X-ray sources, WGACAT, is indeed the quasar. GB 1428+4217 is therefore the brightest X-ray source above a redshift of 4 and has an extremely high isotropic X-ray luminosity, which exceeds that in other (observed) bands. The observed spectral energy distribution of the object therefore peaks at X-ray, or even shorter, wavelengths. We speculate that the emission in the object is beamed toward us.

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DO - 10.1093/mnras/291.1.l5

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JO - Monthly Notices of the Royal Astronomical Society

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IS - 1

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The extreme X-ray luminosity of the z = 4.72 radio-loud quasar GB 1428+4217

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