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The Dark Energy Spectroscopic Instrument: one-dimensional power spectrum from first Ly α forest samples with Fast Fourier Transform


Abstract We present the one-dimensional Ly α forest power spectrum measurement using the first data provided by the Dark Energy Spectroscopic Instrument (DESI). The data sample comprises 26 330 quasar spectra, at redshift z > 2.1, contained in the DESI Early Data Release and the first 2 months of the main survey. We employ a Fast Fourier Transform (FFT) estimator and compare the resulting power spectrum to an alternative likelihood-based method in a companion paper. We investigate methodological and instrumental contaminants associated with the new DESI instrument, applying techniques similar to previous Sloan Digital Sky Survey (SDSS) measurements. We use synthetic data based on lognormal approximation to validate and correct our measurement. We compare our resulting power spectrum with previous SDSS and high-resolution measurements. With relatively small number statistics, we successfully perform the FFT measurement, which is already competitive in terms of the scale range. At the end of the DESI survey, we expect a five times larger Ly α forest sample than SDSS, providing an unprecedented precise one-dimensional power spectrum measurement.
Authors Corentin Ravoux ORCID , Munawar Karim ORCID , E. Armengaud ORCID , Michael Walther ORCID , Naim Göksel Karaçaylı ORCID , Paul Martini ORCID , J. Guy ORCID , Jessica Nicole Aguilar ORCID , S. P. Ahlen ORCID , S. Bailey ORCID , Julian Bautista ORCID , S. F. Beltran ORCID , David J. Brooks ORCID , L Cabayol-Garcia , Solène Chabanier ORCID , Edmond Chaussidon ORCID , Jonás Chaves-Montero ORCID , Kyle Dawson ORCID , Rodrigo de la Cruz ORCID , Axel de la Macorra ORCID , P. Doel ORCID , Kevin Fanning ORCID , Andreu Font-Ribera ORCID , Jaime E. Forero-Romero ORCID , Satya Gontcho A Gontcho ORCID , Alma X. González‐Morales ORCID , Calum Gordon , H. K. Herrera-Alcantar ORCID , K. Honscheid ORCID , Vid Iršič ORCID , Mustapha Ishak , R. Kehoe ORCID , T. S. Kisner ORCID , Anthony Kremin ORCID , Martin Landriau ORCID , L. Le Guillou ORCID , Michael Levi , Zarija Lukić ORCID , C. Magneville , Aaron M. Meisner ORCID , R. Miquel ORCID , John Moustakas ORCID , Eva-Maria Mueller ORCID , A. Muñoz-Gutiérrez ORCID , L. Napolitano University of Wyoming , Jundan Nie ORCID , Gustavo Niz ORCID , N. Palanque‐Delabrouille ORCID , Will J. Percival ORCID , Ignasi Pérez-Ràfols ORCID , Matthew M. Pieri ORCID , Claire Poppett , Francisco Prada ORCID , C. J. Perez , Graziano Rossi , E. Sánchez ORCID , David J. Schlegel ORCID , M. Schubnell ORCID , Hee‐Jong Seo ORCID , Francesco Sinigaglia ORCID , Ting Tan ORCID , G. Tarlé ORCID , Ben Wang ORCID , B. A. Weaver , Ch Yèche ORCID , Zhimin Zhang ORCID
Journal Info Oxford University Press | Monthly Notices of the Royal Astronomical Society , vol: 526 , iss: 4 , pages: 5118 - 5140
Publication Date 10/5/2023
ISSN 0035-8711
TypeKeyword Image article
Open Access hybrid Hybrid Access
DOI https://doi.org/10.1093/mnras/stad3008
KeywordsKeyword Image Singular Spectrum Analysis (Score: 0.484154)