arxiv: astro-ph/9907033 · v1 · submitted 1999-07-02 · 🌌 astro-ph

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

A.C. Fabian (1) , A. Celotti (2 , 1) , G. Pooley (3) , K. Iwasawa (1) , W.N. Brandt (4) , R.G. McMahon (1) , M.D. Hoenig (1) ((1) IOA

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Cambridge UK (2) S.I.S.S.A. Trieste Italy (3) Cavendish Laboratories (4) Dep. Astronomy Astrophysics University Park USA)

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keywords blazarextremenearbyvariabilityalreadybandbillionblack

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

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