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Selection of ThAr lines for wavelength calibration of echelle spectra and implications for variations in the fine-structure constant

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Academic year: 2021

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Figure

Figure 2. Lines from all categories placed on the UVES intensity scale.
Figure 3. Removal of strongly blended lines. Right-hand panel: The shift in the centroid of a synthetic Gaussian due to blending with a weaker line
Figure 5. Distribution of the absolute velocity difference between the cen- cen-troids of two Gaussian fits – one made including the slope parameter, the other made with the slope fixed to zero – versus the normalized contin-uum slope
Figure 7. Histograms showing the contributions from Th, Ar and unidentified lines to the initial (left-hand panel) and final (right-hand panel) ThAr line-lists.
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