{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/baryon-acoustic-oscillations-at-z-2-34-from","title":"Baryon acoustic oscillations at z = 2.34 from the correlations of Ly$\\alpha$ absorption in eBOSS DR14","arxiv_id":"1904.03400","date":"2019-04-06","proceeding":null,"authors":["Victoria de Sainte Agathe","Christophe Balland","Hélion du Mas des Bourboux","Nicolás G. Busca","Michael Blomqvist","Julien Guy","James Rich","Andreu Font-Ribera","Matthew M. Pieri","Julian E. Bautista","Kyle Dawson","Jean-Marc Le Goff","Axel de la Macorra","Nathalie Palanque-Delabrouille","Will J. Percival","Ignasi Pérez-Ràfols","Donald P. Schneider","Anže Slosar","Christophe Yèche"],"abstract":"We measure the imprint of primordial baryon acoustic oscillations (BAO) in the correlation function of Ly$\\alpha$ absorption in quasar spectra from the Baryon Oscillation Spectroscopic Survey (BOSS) and the extended BOSS (eBOSS) in Data Release 14 (DR14) of the Sloan Digital Sky Survey (SDSS)-IV. In addition to 179,965 spectra with absorption in the Lyman-$\\alpha$ (Ly$\\alpha$) region, we use, for the first time, Ly$\\alpha$ absorption in the Lyman-$\\beta$ region of 56,154 spectra. We measure the Hubble distance, $D_H$, and the comoving angular diameter distance, $D_M$, relative to the sound horizon at the drag epoch $r_d$ at an effective redshift $z=2.34$. Using a physical model of the correlation function outside the BAO peak, we find $D_H(2.34)/r_d=8.86\\pm 0.29$ and $D_M(2.34)/r_d=37.41\\pm 1.86$, within 1$\\sigma$ from the flat-$\\Lambda$CDM model consistent with CMB anisotropy measurements. With the addition of polynomial \"broadband\" terms, the results remain within one standard deviation of the CMB-inspired model. Combined with the quasar-Ly$\\alpha$ cross-correlation measurement presented in a companion paper Blomqvist19, the BAO measurements at $z=2.35$ are within 1.7$\\sigma$ of the predictions of this model.","url_abs":"http://arxiv.org/abs/1904.03400v2","url_pdf":"http://arxiv.org/pdf/1904.03400v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"baryon-acoustic-oscillations-at-z-2-34-from","repo_url":"https://github.com/igmhub/picca","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}