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The 3-53 keV Spectrum of the Quasar 1508+5714: X-rays from z = 4.3 | | Edward C. Moran
; David J. Helfand
; | | Date: |
19 May 1997 | | Subject: | astro-ph | | Affiliation: | LLNL) and David J. Helfand (Columbia U. | | Abstract: | We present a high-quality X-ray spectrum in the 3--53 keV rest-frame band of the radio-loud quasar 1508+5714, 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. | | Source: | arXiv, astro-ph/9705141 | | Services: | Forum | Review | PDF | Favorites | |
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