SIMBAD references

1999MNRAS.308L...6F - Mon. Not. R. Astron. Soc., 308, L6-L10 (1999/September-1)

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

FABIAN A.C., CELOTTI A., POOLEY G., IWASAWA K., BRANDT W.N., McMAHON R.G. and HOENIG M.D.

Abstract (from CDS):

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.

Abstract Copyright: 1999 RAS

Journal keyword(s): quasars: individual: GB 1428+4217 - X-rays: galaxies - X-rays: general

CDS comments: GB 1428+4217 = GB6 B1428+4217

Simbad objects: 5

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