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Title:
The 3--53 keV Spectrum of the Quasar 1508+5714: X-Rays from Z = 4.3
Authors:
Moran, Edward C.; Helfand, David J.
Publication:
Astrophysical Journal Letters v.484, p.L95 (ApJL Homepage)
Publication Date:
08/1997
Origin:
APJ
ApJ Keywords:
GALAXIES: ACTIVE, GALAXIES: QUASARS: INDIVIDUAL ALPHANUMERIC: 1508+5714, X-RAYS: GALAXIES
DOI:
10.1086/310787
Bibliographic Code:
1997ApJ...484L..95M

Abstract

We present a high-quality X-ray spectrum in the 3--53 keV rest frame band of the radio-loud quasar 1508+5714, which is by far the brightest known X-ray source at z > 4. A simple power-law model with an absorption column density equal to the Galactic value in the direction of the source provides an excellent and fully adequate fit to the data; the measured power-law photon index Gamma = 1.42 ^{+0.13}_{-0.10} . Upper limits to Fe K alpha line-emission and Compton-reflection components are derived. We offer evidence for both X-ray and radio variability in this object and provide the first contemporaneous radio spectrum ( alpha = -0.25). The data are all consistent with a picture in which the emission from this source is dominated by a relativistically beamed component in both the X-ray and radio bands.
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