Table 4: Fundamental photon noise limits $\tilde{\sigma}^{\rm lim}_{\Delta\alpha/\alpha}$ (in units of 10-5) for Fe II pairs of lines ( $\lambda 1608/X$) from the $z_{\rm abs}$ = 1.839 system toward Q 1101-264. The exposure time  $t_{\rm exp}$ and the total efficiency  $\varepsilon _{\rm tot}$ are set to 3600 s and 0.15, respectively.
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Article Contents
1 Introduction
2 Construction of the Fe II sample
3 Velocity shifts between individual exposures
4 The single ion differential $\alpha $ measurement
5 Analysis and the $\Delta \alpha /\alpha $ results
6 The fundamental noise limitation in the $\Delta \alpha /\alpha $ measurement
7 Discussion and outlook
8 Conclusions
References
List of tables
List of figures