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3D correlations in the Lyman-α forest from early DESI data


Abstract We present the first measurements of Lyman- α (Ly α ) forest correlations using early data from the Dark Energy Spectroscopic Instrument (DESI). We measure the auto-correlation of Ly α absorption using 88 509 quasars at z > 2, and its cross-correlation with quasars using a further 147 899 tracer quasars at z ≳ 1.77. Then, we fit these correlations using a 13-parameter model based on linear perturbation theory and find that it provides a good description of the data across a broad range of scales. We detect the BAO peak with a signal-to-noise ratio of 3.8 σ , and show that our measurements of the auto- and cross-correlations are fully-consistent with previous measurements by the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). Even though we only use here a small fraction of the final DESI dataset, our uncertainties are only a factor of 1.7 larger than those from the final eBOSS measurement. We validate the existing analysis methods of Ly α correlations in preparation for making a robust measurement of the BAO scale with the first year of DESI data.
Authors Chris Gordon ORCID , Andrei Cuceu ORCID , J. Chaves-Montero , Andreu Font-Ribera ORCID , Alma X. González‐Morales ORCID , Jessica Nicole Aguilar ORCID , S. P. Ahlen ORCID , E. Armengaud ORCID , S. Bailey ORCID , A. Bault ORCID , A. Brodzeller , D. Brooks ORCID , Todd Claybaugh , R. de la Cruz , Kyle Dawson ORCID , P. Doel ORCID , Jaime E. Forero-Romero ORCID , Satya Gontcho A Gontcho ORCID , J. Guy ORCID , H. K. Herrera-Alcantar ORCID , Vid Iršič ORCID , Naim Göksel Karaçaylı ORCID , D. Kirkby ORCID , Martin Landriau ORCID , L. Le Guillou ORCID , M. E. Levi ORCID , Axel de la Macorra ORCID , Marc Manera ORCID , Paul Martini ORCID , Aaron M. Meisner ORCID , R. Miquel ORCID , P. Montero-Camacho , A. Muñoz-Gutiérrez ORCID , L. Napolitano University of Wyoming , Jundan Nie , Gustavo Niz ORCID , N. Palanque‐Delabrouille ORCID , Will J. Percival ORCID , Matthew M. Pieri ORCID , Claire Poppett , Francisco Prada ORCID , Ignasi Pérez-Ràfols ORCID , C. Ramírez-Pérez , Corentin Ravoux ORCID , Mehdi Rezaie ORCID , Ashley J. Ross ORCID , Graziano Rossi , E. Sánchez ORCID , David J. Schlegel ORCID , M. Schubnell ORCID , Hee‐Jong Seo ORCID , F. Sinigaglia , Ting Tan ORCID , G. Tarlé ORCID , Michael Walther ORCID , B. A. Weaver , Ch Yèche ORCID , Zhimin Zhang ORCID , Hu Zou ORCID
Journal Info Institute of Physics | Journal of Cosmology and Astroparticle Physics , vol: 2023 , iss: 11 , pages: 045 - 045
Publication Date 11/1/2023
ISSN 1475-7516
TypeKeyword Image article
Open Access bronze Bronze Access
DOI https://doi.org/10.1088/1475-7516/2023/11/045
KeywordsKeyword Image Baryon Acoustic Oscillations (Score: 0.44772)