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| Paper: |
The Cross-Correlogram as a Visual Analytic Tool for Wavelength Calibration Strategies |
| Volume: |
538, ADASS XXXII |
| Page: |
289 |
| Authors: |
Mike Birchall |
| DOI: |
10.26624/ZXCR4759 |
| Abstract: |
The cross-correlogram of two similar, binned spectra is an image representation of the cross-correlation function derived for a small window centered at each
binned spectral value. As such, it can highlight the shift between similar spectra as
variants along the spectral range. When given an image of a spectrum obtained with a
calibration arc lamp, a crude calibration guide, and a line list for that lamp, it is possible to simulate an expected spectrum from the line list and the image spectrum range.
From these two spectra, a cross-correlogram can be generated, and visual inspection
can then identify the functional form of the wavelength correction function needed and
areas where, due to the lack of adequately placed lines, the reliability of the fit is compromised. In this paper, we present some real examples. |
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