Further constraints on variation of the fine structure constant from alkali doublet QSO absorption lines

Details Further constraints on variation of the fine structure constant from alkali doublet QSO absorption lines Further constraints on variation of the fine structure constant from alkali doublet QSO absorption lines

2000-12-20

arxiv.org/abs/astro-ph/0012421v3

Mon.Not.Roy.Astron.Soc.327:1237,2001

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, Accepted by MNRAS, small changes after referee's comments, accepted version

Scientific paper

10.1046/j.1365-8711.2001.04842.x

Comparison of quasar absorption line spectra with laboratory spectra provides a precise probe for variability of the fine structure constant, alpha, over cosmological time-scales. We constrain variation in alpha in 21 Keck/HIRES Si IV absorption systems using the alkali doublet (AD) method in which changes in alpha are related to changes in the doublet spacing. The precision obtained with the AD method has been increased by a factor of 3: da/a = (-0.5 +/- 1.3) * 10^{-5}. We also analyse potential systematic errors in this result. Finally, we compare the AD method with the many-multiplet method which has achieved an order of magnitude greater precision and we discuss the future of the AD method.

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