Production of Alternate Realizations of DESI Fiber Assignment for Unbiased Clustering Measurement in Data and Simulations

Understand

A critical requirement of spectroscopic large scale structure analyses is correcting for selection of which galaxies to observe from an isotropic target list.

• This selection is often limited by the hardware used to perform the survey which will impose angular constraints of simultaneously observable targets, requiring multiple passes to observe all of them.
• In SDSS this manifested solely as the collision of physical fibers and plugs placed in plates.
• In DESI, there is the additional constraint of the robotic positioner which controls each fiber being limited to a finite patrol radius.