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

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

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pgqa.conf..409c&link_type=abstract

Probing Galaxies through Quasar Absorption Lines, IAU Colloquium Proceedings of the International Astronomical Union 199, held M

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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 α(≡ {e2/hbar c}) obtained using UVES/VLT samples of QSO absorption systems. We find {w={(-0.06±0.06)×10-5} using 23 Mg II systems and the many-multiplet (mm) method. Well selected 15 Si IV systems provide {w={(0.15±0.43)×10-5}. Absence of detectable variation in α is also confirmed by our new very high resolution (r˜ 100,000) observation of zabs=1.1508 toward He 0515-4414 using harps on the ESO 3.6m telescope.

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