Photometric Redshift Estimation of Distant Quasars
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2016-07-07
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en
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Abstract
Light emitted by celestial objects is shifted towards higher wavelengths when
it reaches Earth. This is called redshift. Photometric redshift estimation is
necessary to process the large amount of data produced by contemporary and
future telescopes. However, the lter bands recorded by the Sloan Digital
Sky Survey are not su cient for accurate estimation of the redshift of highredshift
quasars. Filter bands that cover higher wavelengths, such as those in
the WISE and UKIDSS catalogues provide more information. Taking these
lter bands into account causes the problem of missing data, since they might
not be available for every object. This thesis explores three ways of dealing
with missing data: (1) discarding all objects with missing data, (2) training
multiple models and (3) naively imputing the missing data.
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Faculteit der Sociale Wetenschappen