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Astron. Astrophys. 336, L29-L32 (1998)

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Letter to the Editor

The D/H ratio at z = 0.7 toward Q 1718+4807

Sergei A. Levshakov * 1, Wilhelm H. Kegel 2 and Fumio Takahara 3

1 National Astronomical Observatory, Mitaka, Tokyo 181, Japan
2 Institut für Theoretische Physik der Universität Frankfurt am Main, Postfach 11 19 32, D-60054 Frankfurt/Main, Germany
3 Department of Earth and Space Science, Faculty of Science, Osaka University, Toyonaka, Osaka 560, Japan

Received 9 December 1997 / Accepted 16 June 1998


The apparent discrepancy between low and high D abundances derived from QSO spectra may be caused by spatial correlations in the stochastic velocity field. If one accounts for such correlations, one finds good agreement between different observations and the theoretical predictions for standard big bang nucleosynthesis (SBBN). In particular, we show that the H+D Ly[FORMULA] profile observed at [FORMULA] toward Q 1718+4807 is compatible with [FORMULA]. This result is consistent with our previous D/H determination for the [FORMULA] system toward Q 1009+2956 and, thus, supports SBBN.

Key words: line: formation – line: profiles – quasars: absorption lines – quasars: individual: Q 1718+4807

* Permanent address: Ioffe Physico-Technical Institute, 194021 St.Petersburg, Russia

Send offprint requests to: W.H. Kegel (e-mail: kegel@astro.uni-frankfurt.de)

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© European Southern Observatory (ESO) 1998

Online publication: July 20, 1998