Mitigating the Impact of the DESI Fiber Assignment on Galaxy Clustering

Abstract

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. The new statistic can be computed with a slight modification to the data catalogues input to the standard correlation function code and does not incur any additional computational time. Finally we show that the spherically averaged baryon acoustic oscillation signal is not biased by the new statistic.

16 pages, 7 figures, 1 table

References in corpus (4)

• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
• The DESI Experiment Part II: Instrument Design
• Efficient Reconstruction of Linear Baryon Acoustic Oscillations in Galaxy Surveys

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• The halo light cone catalogues of \Abacus{AbacusSummit}
• Observational Measures of Halo Properties Beyond Mass
• Angular systematics-free cosmological analysis of galaxy clustering in configuration space
• Uncertainty in the visibility mask of a survey and its effects on the clustering of biased tracers
• Measuring our peculiar velocity from spectroscopic redshift surveys
• Preliminary clustering properties of the DESI BGS bright targets using DR9 Legacy Imaging Surveys
• Mitigating the impact of fiber assignment on the measurement of galaxy-lensing cross correlation