Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-12-13
Astronomy and Astrophysics
Astrophysics
23 pages, including 5 Postscript figures, in gzip-ed uuencoded postscript format. Accepted for publication in A&A
Scientific paper
We present results from 12 km/s resolution echelle spectroscopy of the bright $z=4.694$ QSO BR1202-0725. A preliminary analysis shows that high metallicity narrow line absorption clouds are present up to the redshift of the quasar. A damped Ly$\alpha$ system with an HI column density of $3.1 \times 10^{20}$ cm$^{-2}$ at $z=4.383$ has an [O/H] ratio that is about 0.01 solar, while another absorption system with an HI column density of $5.0 \times 10^{16}$ cm$^{-2}$ at $z=4.672$, may have an O/H ratio that is twice solar. An upper limit, or the possible detection of deuterium in this absorption cloud gives a D/H ratio of about 1.5\,10$^{-4}$. Because this cloud is metal rich at least some of the cloud gas has been processed after the beginning of the Universe.
Baldwin John A.
Carswell Robert F.
Hazard Cyril
McMahon Richard G.
Wampler Joseph E.
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