Templates documentation

[saimn]

There are a few field in the templates definition that are not described, and seems unused: features, featureWeights ?

Some other are used but have no description: z_end2, weights, isStar, isQuasar

[Samreay]

I've added a line or two to the doco, but to go through it here as well:

• z_end2 is used in conjunction with z_end for stellar spectra. If we simply used z_end for stars, because their allowed redshift range is so small, the RMS normalisation of their xcor array would give them massive peaks. Instead, we normalise over a larger redshift range, but restrict matched redshifts to a separate smaller range.
• weights is used to adjust the xcor peak height when given prior information about the object.
• isStar is used only for QOP purposes, as the flag system used by OzDES has (for example) a 4 for a confident redshift of a galactic object, but a 6 for a confident redshift of a stellar object. isStar simply determines which number to give.
• quasar, unlike isStar actually changes the fitting methodology used so that broad features are not subtracted.

I have also commented out two other properties I never got to work: features and featureWeights. The plan for these was to be able to construct artificial spectra using this information, so I could test that there was no bias in fitting to the the templates. However, issues (such as outflow for quasars) make this physical impractical, and I instead test systematic offsets using completely artificial spectra.

[saimn]

Thanks for these explanations !