Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-05
Mon.Not.Roy.Astron.Soc.315:L23,2000
Astronomy and Astrophysics
Astrophysics
6 pages incl. 6 figures, accepted for publication in Monthly Notices
Scientific paper
10.1046/j.1365-8711.2000.03635.x
We report on a ROSAT PSPC observation of the highly-luminous z = 4.72 radio-loud quasar GB 1428+4217 obtained between 1998 December 11 and 17, the final days of the ROSAT satellite. The low-energy sensitivity of the PSPC detector was employed to constrain the intrinsic X-ray absorption of the currently most distant X-ray detected object. Here we present the detection of significant soft X-ray absorption towards GB 1428+4217, making the absorbing material the most distant matter yet probed with X-ray spectroscopy. X-ray variability by 25+-8 per cent is detected on a timescale of 6500 s in the rest frame. The X-ray variation requires an unusually high radiative efficiency of at least 4.2, further supporting the blazar nature of the source.
Boller Th.
Brandt Wiliam N.
Fabian Andrea C.
Freyberg Michael J.
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