The Construction of Large-scale Structure Catalogs for the Dark Energy Spectroscopic Instrument
Abstract
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.
Keywords
Cite
@article{arxiv.2405.16593,
title = {The Construction of Large-scale Structure Catalogs for the Dark Energy Spectroscopic Instrument},
author = {A. J. Ross and J. Aguilar and S. Ahlen and S. Alam and A. Anand and S. Bailey and D. Bianchi and S. Brieden and D. Brooks and E. Burtin and A. Carnero Rosell and E. Chaussidon and T. Claybaugh and S. Cole and K. Dawson and A. de la Macorra and A. de Mattia and Arjun Dey and Biprateep Dey and P. Doel and K. Fanning and S. Ferraro and J. Ereza and A. Font-Ribera and J. E. Forero-Romero and E. Gaztañaga and H. Gil-Marín and S. Gontcho A Gontcho and A. X. Gonzalez-Morales and J. Guy and C. Hahn and S. Heydenreich and K. Honscheid and C. Howlett and M. Ishak and T. Karim and D. Kirkby and T. Kisner and H. Kong and A. Kremin and A. Krolewski and A. Lambert and M. Landriau and J. Lasker and L. Le Guillou and M. E. Levi and M. Manera and P. Martini and P. McDonald and A. Meisner and R. Miquel and J. Moon and J. Moustakas and A. Muñoz-Gutiérrez and A. D. Myers and S. Nadathur and L. Napolitano and J. A. Newman and J. Nie and G. Niz and N. Palanque-Delabrouille and W. J. Percival and C. Poppett and F. Prada and A. Raichoor and C. Ravoux and M. Rezaie and A. Rosado-Marin and G. Rossi and L. Samushia and E. Sanchez and E. F. Schlafly and D. Schlegel and H. Seo and A. Smith and D. Sprayberry and G. Tarlé and D. Valcin and M. Vargas-Magaña and B. A. Weaver and M. Wilson and J. Yu and P. Zarrouk and C. Zhao and R. Zhou and H. Zou},
journal= {arXiv preprint arXiv:2405.16593},
year = {2024}
}
Comments
Accepted (by JCAP) version of supporting publication of DESI 2024II: Sample definitions, characteristics, and two-point clustering statistics