Volume 430, Number 1, January IV 2005
|Page(s)||47 - 58|
|Section||Cosmology (including clusters of galaxies)|
|Published online||12 January 2005|
Probing the time-variation of the fine-structure constant: Results based on Si IV doublets from a UVES sample*
IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, India e-mail: email@example.com
2 Institut d'Astrophysique de Paris – CNRS, 98bis Boulevard Arago, 75014 Paris, France
3 LERMA, Observatoire de Paris, 61 Rue de l'Observatoire, 75014 Paris, France
4 Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003-9305, USA
Accepted: 9 September 2004
We report a new constraint on the variation of the fine-structure constant based on the analysis of 15 Si iv doublets selected from a ESO-UVES sample. We find = over a redshift range of which is consistent with no variation in α. This result represents a factor of three improvement on the constraint on based on Si iv doublets compared to the published results in the literature. The alkali doublet method used here avoids the implicit assumptions used in the many-multiplet method that chemical and ionization inhomogeneities are negligible and isotopic abundances are close to the terrestrial value.
Key words: quasars: absorption lines / cosmology: observations
© ESO, 2005
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