High Resolution Observations of the QSO BR1202-0725: Deuterium and Ionic Abundances at Redshifts Above z=4

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dc.creatorWampler, E. J.
dc.creatorWilliger, G. M.
dc.creatorBaldwin, J. A.
dc.creatorCarswell, R. F.
dc.creatorHazard, C.
dc.creatorMcMahon, R. G.
dc.date1995-12-13
dc.date.accessioned2026-07-07T02:20:36Z
dc.date.available2026-07-07T02:20:36Z
dc.descriptionWe 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$α$ 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.
dc.description23 pages, including 5 Postscript figures, in gzip-ed uuencoded postscript format. Accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9512084
dc.identifierhttp://arxiv.org/abs/astro-ph/9512084
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10260
dc.subjectAstrophysics
dc.titleHigh Resolution Observations of the QSO BR1202-0725: Deuterium and Ionic Abundances at Redshifts Above z=4
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