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

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...

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Veröffentlicht in:	Monthly notices of the Royal Astronomical Society 1999-09, Vol.308 (1), p.L6-L10
Hauptverfasser:	Fabian, A. C., Celotti, A., Pooley, G., Iwasawa, K., Brandt, W. N., McMahon, R. G., Hoenig, M. D.
Format:	Artikel
Sprache:	eng
Schlagworte:	quasars: individual: GB 1428+4217 X-rays: galaxies X-rays: general
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	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.
ISSN:	0035-8711 1365-2966
DOI:	10.1046/j.1365-8711.1999.02910.x