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

A. C. Fabian; A. Celotti; G. Pooley; K. Iwasawa; W. N. Brandt; R. G. McMahon; M. D. Hoenig

doi:10.1046/j.1365-8711.1999.02910.x

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

A. C. Fabian, A. Celotti, G. Pooley, K. Iwasawa, W. N. Brandt, R. G. McMahon, M. D. Hoenig

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22 Citations (SciVal)

Abstract

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.

Original language	English (US)
Pages (from-to)	L6-L10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	308
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.1999.02910.x
State	Published - Sep 1 1999

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1046/j.1365-8711.1999.02910.x

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AU - Fabian, A. C.

AU - Celotti, A.

AU - Pooley, G.

AU - Iwasawa, K.

AU - Brandt, W. N.

AU - McMahon, R. G.

AU - Hoenig, M. D.

PY - 1999/9/1

Y1 - 1999/9/1

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AB - 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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