The clustering of Lyman Alpha Emitting galaxies at 𝗓=2–3
Martin White, Anand Raichoor, Arjun Dey, Lehman H. Garrison, Eric Gawiser, Dustin Lang, Kyoung-Soo Lee, Adam D. Myers, David J. Schlegel, F. Valdés, J. Aguilar, S. P. Ahlen, D. Brooks, E. Chaussidon, T. Claybaugh, Kyle Dawson, Axel de la Macorra, Biprateep Dey, P. Doel, K. Fanning, Andreu Font-Ribera, J. E. Forero-Romero, Satya Gontcho A Gontcho, G. Gutiérrez, J. Guy, K. Honscheid, D. Kirkby, Anthony Kremin, Martin Landriau, L. Le Guillou, M. E. Levi, C. Magneville, Marc Manera, Paul Martini, Aaron Meisner, R. Miquel, Byeongha Moon, Jeffrey A. Newman, Gustavo Niz, N. Palanque‐Delabrouille, C. Park, Will J. Percival, Francisco Prada, Graziano Rossi, V. Ruhlmann-Kleider, E. Sánchez, Edward F. Schlafly, M. Schubnell, Hee‐Jong Seo, David Sprayberry, G. Tarlé, B. A. Weaver, Yujin Yang, Christophe Yèche, Hu Zou
Abstract
Abstract We measure the clustering of Lyman Alpha Emitting galaxies (LAEs) selected from the One-hundred-square-degree DECam Imaging in Narrowbands (ODIN) survey, with spectroscopic follow-up from Dark Energy Spectroscopic Instrument (DESI). We use DESI spectroscopy to optimize our selection and to constrain the interloper fraction and redshift distribution of our narrow-band selected sources. We select samples of 4000 LAEs at z = 2.45 and 3.1 in 9 sq.deg. centered on the COSMOS field with median Lyα fluxes of ≈ 10 -16 erg s -1 cm -2 . Covariances and cosmological inferences are obtained from a series of mock catalogs built upon high-resolution N-body simulations that match the footprint, number density, redshift distribution and observed clustering of the sample. We find that both samples have a correlation length of r 0 = 3.0 ± 0.2 h -1 Mpc. Within our fiducial cosmology these correspond to 3D number densities of ≈ 10 -3 h 3 Mpc -3 and, from our mock catalogs, biases of 1.7 and 2.0 at z = 2.45 and 3.1, respectively. We discuss the implications of these measurements for the use of LAEs as large-scale structure tracers for high-redshift cosmology.