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

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

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291l...5f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 291, Issue 1, pp. L5-L7.

Astronomy and Astrophysics

Astronomy

34

Quasars: General, Quasars: Individual: Gb 1428+4217, X-Rays: Galaxies

Scientific paper

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^-12ergcm^-2s^-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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