This page discusses stacks with an excess in false detections in LAP.ThreePi.20120706

Bill Sweeney

psphotStack has found a large number of false detections in some of the stacks. This issue was discussed in December in the context of y band and changes were made to detect cases where the number of detected sources in y band was much higher than r, i, and z and turn off the feature where all forced photometry is performed in all bands for sources only detected in y.

Now that we have completed stack photometry for the most of the sky we can see how widespread the problem is.

The following plot shows the number of detections per skycell as a function of RA and DEC in g and in y band.