학술논문
3D Correlations in the Lyman-$\alpha$ Forest from Early DESI Data
Document Type
Working Paper
Author
Gordon, Calum; Cuceu, Andrei; Chaves-Montero, Jonás; Font-Ribera, Andreu; González-Morales, Alma Xochitl; 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.; Guillou, L. Le; 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.
Source
Subject
Language
Abstract
We present the first measurements of Lyman-$\alpha$ (Ly$\alpha$) forest correlations using early data from the Dark Energy Spectroscopic Instrument (DESI). We measure the auto-correlation of Ly$\alpha$ absorption using 88,509 quasars at $z>2$, and its cross-correlation with quasars using a further 147,899 tracer quasars at $z\gtrsim1.77$. 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 $3.8\sigma$, 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$\alpha$ correlations in preparation for making a robust measurement of the BAO scale with the first year of DESI data.