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Optimal 1D Lyα Forest Power Spectrum Estimation – III. DESI early data


Abstract The one-dimensional power spectrum P1D of the Lyα forest provides important information about cosmological and astrophysical parameters, including constraints on warm dark matter models, the sum of the masses of the three neutrino species, and the thermal state of the intergalactic medium. We present the first measurement of P1D with the quadratic maximum likelihood estimator (QMLE) from the Dark Energy Spectroscopic Instrument (DESI) survey early data sample. This early sample of 54 600 quasars is already comparable in size to the largest previous studies, and we conduct a thorough investigation of numerous instrumental and analysis systematic errors to evaluate their impact on DESI data with QMLE. We demonstrate the excellent performance of the spectroscopic pipeline noise estimation and the impressive accuracy of the spectrograph resolution matrix with two-dimensional image simulations of raw DESI images that we processed with the DESI spectroscopic pipeline. We also study metal line contamination and noise calibration systematics with quasar spectra on the red side of the Lyα emission line. In a companion paper, we present a similar analysis based on the Fast Fourier Transform estimate of the power spectrum. We conclude with a comparison of these two approaches and discuss the key sources of systematic error that we need to address with the upcoming DESI Year 1 analysis.
Authors Naim Göksel Karaçaylı ORCID , Paul Martini ORCID , J. Guy ORCID , Corentin Ravoux ORCID , Marie Lynn Abdul Karim ORCID , E. Armengaud ORCID , Michael Walther ORCID , J. A. Aguilar ORCID , S. P. Ahlen ORCID , S. Bailey ORCID , J Bautista , S. F. Beltran ORCID , D. Brooks ORCID , L Cabayol-Garcia , Solène Chabanier ORCID , Edmond Chaussidon ORCID , Jonás Chaves-Montero ORCID , Kyle Dawson ORCID , R de la Cruz , Axel de la Macorra ORCID , P. Doel ORCID , Andreu Font-Ribera ORCID , Jaime E. Forero-Romero ORCID , Satya Gontcho A Gontcho ORCID , Alma X. González‐Morales ORCID , Chris Gordon ORCID , 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 , M. E. Levi ORCID , Zarija Lukić ORCID , Aaron M. Meisner ORCID , R. Miquel ORCID , John Moustakas ORCID , Eugene A. Mueller , A. Muñoz-Gutiérrez ORCID , Lorenzo Napolitano University of WyomingORCID , Jundan Nie , Gustavo Niz ORCID , N. Palanque‐Delabrouille ORCID , Will J. Percival ORCID , Matthiew Pieri , Claire Poppett , Francisco Prada ORCID , Ignasi Pérez-Ràfols ORCID , C. Ramírez-Pérez , Graziano Rossi , E. Sánchez ORCID , H. Seo ORCID , Francesco Sinigaglia ORCID , Tu Tan ORCID , G. Tarlé ORCID , Bo Wang ORCID , B. A. Weaver , C. Yéche , Zhiming Zhou ORCID
Journal Info Oxford University Press | Monthly Notices of the Royal Astronomical Society
Publication Date 1/16/2024
ISSN 0035-8711
TypeKeyword Image article
Open Access hybrid Hybrid Access
DOI https://doi.org/10.1093/mnras/stae171
KeywordsKeyword Image High-Energy Astrophysics (Score: 0.463477)