EDP Sciences
Free access
Issue
A&A
Volume 430, Number 1, January IV 2005
Page(s) 47 - 58
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20041186


A&A 430, 47-58 (2005)
DOI: 10.1051/0004-6361:20041186

Probing the time-variation of the fine-structure constant: Results based on Si IV doublets from a UVES sample

H. Chand1, P. Petitjean2, 3, R. Srianand1 and B. Aracil2, 4

1  IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, India
    e-mail: hcverma@iucaa.ernet.in
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

(Received 29 April 2004 / Accepted 9 September 2004)

Abstract
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 $\Delta\alpha/\alpha$ =  ${ (+0.15\pm0.43)\times10^{-5}}$ over a redshift range of ${ 1.59\le z\le 2.92}$ which is consistent with no variation in $\alpha$. This result represents a factor of three improvement on the constraint on $\Delta\alpha/\alpha$  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

SIMBAD Objects



© ESO 2005

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access.

An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account.
    In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.