Mitigating the Impact of the DESI Fiber Assignment on Galaxy Clustering

Understand

We present a simple strategy to mitigate the impact of an incomplete spectroscopic redshift galaxy sample as a result of fiber assignment and survey tiling.

• The method has been designed for the Dark Energy Spectroscopic Instrument (DESI) galaxy survey but may have applications beyond this.
• We propose a modification to the usual correlation function that nulls the almost purely angular modes affected by survey incompleteness due to fiber assignment.
• Predictions of this modified statistic can be calculated given a model of the two point correlation function.