Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-29
Astrophys.J. 573 (2002) L77-L80
Astronomy and Astrophysics
Astrophysics
13 pages, 3 figures, 2 tables, ApJ (Letters), in press
Scientific paper
10.1086/342191
Recent XMM-Newton observations of the high-redshift, lensed, broad absorption line (BAL) quasi-stellar object APM 08279+5255, one of the most luminous objects in the universe, allowed the detection of a high column density absorber ($N_H \approx 10^{23}$ cm$^{-2}$) in the form of a K-shell absorption edge of significantly ionized iron (Fe XV - XVIII) and corresponding ionized lower-energy absorption. Our findings confirm a basic prediction of phenomenological geometry models for the BAL outflow and can constrain the size of the absorbing region. The Fe/O abundance of the absorbing material is significantly higher than solar (Fe/O = 2-5), giving interesting constraints on the gas enrichment history in the early Universe.
Hasinger Guenter
Komossa Stefanie
Schartel Norbert
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