The Construction of Large-scale Structure Catalogs for the Dark Energy Spectroscopic Instrument
arxiv(2024)
摘要
We present the technical details on how large-scale structure (LSS) catalogs
are constructed from redshifts measured from spectra observed by the Dark
Energy Spectroscopic Instrument (DESI). The LSS catalogs provide the
information needed to determine the relative number density of DESI tracers as
a function of redshift and celestial coordinates and, e.g., determine
clustering statistics. We produce catalogs that are weighted subsamples of the
observed data, each matched to a weighted `random' catalog that forms an
unclustered sampling of the probability density that DESI could have observed
those data at each location.
Precise knowledge of the DESI observing history and associated hardware
performance allows for a determination of the DESI footprint and the number of
times DESI has covered it at sub-arcsecond level precision. This enables the
completeness of any DESI sample to be modeled at this same resolution. The
pipeline developed to create LSS catalogs has been designed to easily allow
robustness tests and enable future improvements. We describe how it allows
ongoing work improving the match between galaxy and random catalogs, such as
including further information when assigning redshifts to randoms, accounting
for fluctuations in target density, accounting for variation in the redshift
success rate, and accommodating blinding schemes.
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