PSFs of coadded images

Understand

We provide a detailed exploration of the connection between choice of coaddition schemes and the point-spread function (PSF) of the resulting coadded images.

• In particular, we investigate what properties of the coaddition algorithm lead to the final coadded image having a well-defined PSF.
• The key elements of this discussion are as follows: 1.
• We provide an illustration of how linear coaddition schemes can produce a coadd that lacks a well-defined PSF even for relatively simple scenarios and choices of weight functions.