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

Gordon, C.; Cuceu, A.; Chaves-Montero, J.; Font-Ribera, A.; González-Morales, A. X.; Aguilar, J.; Ahlen, S.; Armengaud, E.; Bailey, S.; Bault, A.; Brodzeller, A.; Brooks, D.; Claybaugh, T.; de la Cruz, R.; Dawson, K.; Doel, P.; Forero-Romero, J. E.; Gontcho, S. Gontcho A.; Guy, J.; Herrera-Alcantar, H. K.; Iršič, V.; Karaçaylı, N. G.; Kirkby, D.; Landriau, M.; Le Guillou, L.; Levi, M. E.; de la Macorra, A.; Manera, M.; Martini, P.; Meisner, A.; Miquel, R.; Montero-Camacho, P.; Muñoz-Gutiérrez, A.; Napolitano, L.; Nie, J.; Niz, G.; Palanque-Delabrouille, N.; Percival, W. J.; Pieri, M.; Poppett, C.; Prada, F.; Pérez-Ràfols, I.; Ramírez-Pérez, C.; Ravoux, C.; Rezaie, M.; Ross, A. J.; Rossi, G.; Sanchez, E.; Schlegel, D.; Schubnell, M.; Seo, H.; Sinigaglia, F.; Tan, T.; Tarlé, G.; Walther, M.; Weaver, B. A.; Yèche, C.; Zhou, Z.; Zou, H.
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Journal of Cosmology and Astroparticle Physics

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We present the first measurements of Lyman-α (Lyα) forest correlations using early data from the Dark Energy Spectroscopic Instrument (DESI). We measure the auto-correlation of Lyα 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 3.8σ, 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 Lyα correlations in preparation for making a robust measurement of the BAO scale with the first year of DESI data.
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