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Probing the variation of the fine-structure constant using QSO absorption lines

Published online by Cambridge University Press:  06 October 2005

H. Chand
Affiliation:
IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, India
R. Srianand
Affiliation:
IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, India
P. Petitjean
Affiliation:
Institut d'Astrophysique de Paris – CNRS, 98bis Boulevard Arago, F-75014 Paris, France
B. Aracil
Affiliation:
Institut d'Astrophysique de Paris – CNRS, 98bis Boulevard Arago, F-75014 Paris, France Present address: Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003-9305, USA.
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Abstract

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Search for the time variation of the fundamental constants is motivated by various unification theories. Here we present constraints on the variation of the fine-structure constant $\alpha$($\equiv {e^2/\hbar c}$) obtained using UVES/VLT samples of QSO absorption systems. We find ${<\Delta\alpha/\alpha}>_{w}={(-0.06\pm0.06)\times10^{-5}}$ using 23 Mg II systems and the many-multiplet (MM) method. Well selected 15 Si IV systems provide ${<\Delta\alpha/\alpha}>_{w}={(0.15\pm0.43)\times10^{-5}}$. Absence of detectable variation in $\alpha$ is also confirmed by our new very high resolution ($R\sim 100,000$) observation of $z_{\rm abs}=1.1508$ toward HE 0515–4414 using HARPS on the ESO 3.6m telescope.

Type
Contributed Papers
Copyright
© 2005 International Astronomical Union