Introduction to Image Reduction
Introduction to Image Reduction
Introduction to Image Reduction
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Motivation & background Instrumental Signature Removal Combining multiple images Pho<strong>to</strong>metric calibration<br />
Beyond Standard Flatfielding<br />
Ubercal (Padmanabhan et al 2008): use object pho<strong>to</strong>metry from multiple<br />
shifted expsures <strong>to</strong> solve for a model of required flatfield corrections.<br />
minstr = mtrue + kA + f (x, y)<br />
where A is the airmass of each exposure (assuming a pho<strong>to</strong>metric night!).<br />
Solve for k, f (x, y), and mtrue for each star (nuisance parameters). f (x, y)<br />
should be zero if standard flatfielding has worked.<br />
Results from Deep Lens Survey: ∼ 0.05 mag variations
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