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Reimers, D.
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article
The UVES large program for testing fundamental physics II: constraints Delta mu /mu towards quasar HE 0027 - 1836
Abstract
We study the variation of proton-to-electron mass ratio, mu , using the H_2 absorption lines from the z_abs ̃ 2.4018 DLA system towards HE 0027 - 1836 observed with the VLT/UVES as a part of the ESO Large Program for testing fundamental physics. A cross-correlation analysis between individual exposures and the combined spectrum and asteroid observations show the existence of a possible wavelength dependent drift in the UVES observation. We find that a two component Voigt profile model can best fit the H_2 absorption profile and give Delta mu /mu = -2.5 ± 8.1_stat ± 6.2_sys ppm. When we apply the correction to the wavelength dependent velocity drift we find Delta mu /mu = -7.6 ± 8.1_stat± 6.3_sys ppm. <P />...