An unsuccessful search for deuterium in Lyman-alpha absorption systems

Details An unsuccessful search for deuterium in Lyman-alpha absorption systems An unsuccessful search for deuterium in Lyman-alpha absorption systems

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..581a&link_type=abstract

IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr

Mathematics

Logic

3

Absorption Spectra, Astronomical Spectroscopy, Deuterium, Lyman Alpha Radiation, Quasars, Lyman Spectra, Red Shift

Scientific paper

Echelle spectra of the high-redshift quasar Q0420-388 (z = 3.12) have been used to obtain velocity dispersions and H I column densities for a large number of the Lyman line-absorbing clouds. Most systems have column densities quite near the detection limit of about 5×1013 H I atoms cm-2, and systems with column densities above 1015 cm-2 are very rare. The authors have found no Lyman forest clouds for which the deuterium to hydrogen ratio could be measured unless it were to have a cosmologically implausible value of >10-2.

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