Variability of the extreme z=4.72 blazar, GB 1428+4217

Details Variability of the extreme z=4.72 blazar, GB 1428+4217 Variability of the extreme z=4.72 blazar, GB 1428+4217

1999-07-02

arxiv.org/abs/astro-ph/9907033v1

Astronomy and Astrophysics

Astrophysics

MNRAS, in press - 5 pages, 5 figures

Scientific paper

10.1046/j.1365-8711.1999.02910.x

We report X-ray and radio variability of GB 1428+4217 which confirm its blazar nature. IR observations reveal a powerful optical-UV component, not obscured by dust, which is suggestive of the presence of a billion solar mass black hole, already formed by z ~ 5. A detailed comparison of the broad band spectral properties of GB 1428+4217 with those of nearby blazars shows it to be extreme, but nevertheless consistent with the trend found for nearby sources.

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