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Quasar-Lyman α forest cross-correlation from BOSS DR11: Baryon Acoustic Oscillations

Research output: Contribution to journalArticle

  • Andreu Font-Ribera
  • David Kirkby
  • Nicolas Busca
  • Jordi Miralda-Escudé
  • Anže Slosar
  • James Rich
  • Éric Aubourg
  • Stephen Bailey
  • Vaishali Bhardwaj
  • Julian Bautista
  • Dmitry Bizyaev
  • Michael Blomqvist
  • Howard Brewington
  • Jon Brinkmann
  • Joel R. Brownstein
  • Bill Carithers
  • Kyle S. Dawson
  • Timothée Delubac
  • Garrett Ebelke
  • Daniel J. Eisenstein
  • Jian Ge
  • Karen Kinemuchi
  • Khee Gan Lee
  • Viktor Malanushenko
  • Elena Malanushenko
  • Moses Marchante
  • Daniel Margala
  • Demitri Muna
  • Adam D. Myers
  • Pasquier Noterdaeme
  • Daniel Oravetz
  • Nathalie Palanque-Delabrouille
  • Isabelle Pâris
  • Patrick Petitjean
  • Matthew M. Pieri
  • Graziano Rossi
  • Donald P. Schneider
  • Audrey Simmons
  • Matteo Viel
  • Christophe Yeche
  • Donald G. York

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Original languageEnglish
Article number027
Number of pages26
JournalJournal of Cosmology and Astroparticle Physics (JCAP)
Issue number5
Publication statusPublished - 20 May 2014


We measure the large-scale cross-correlation of quasars with the Lyα forest absorption, using over 164,000 quasars from Data Release 11 of the SDSS-III Baryon Oscillation Spectroscopic Survey. We extend the previous study of roughly 60,000 quasars from Data Release 9 to larger separations, allowing a measurement of the Baryonic Acoustic Oscillation (BAO) scale along the line of sight c/(H(z = 2.36)rs) = 9.0±0.3 and across the line of sight DA (z = 2.36)/rs = 10.8±0.4, consistent with CMB and other BAO data. Using the best fit value of the sound horizon from Planck data (rs = 147.49 Mpc), we can translate these results to a measurement of the Hubble parameter of H(z = 2.36) = 226±8 km s -1 Mpc-1 and of the angular diameter distance of D A (z = 2.36) = 1590±60 Mpc. The measured cross-correlation function and an update of the code to fit the BAO scale (baofit) are made publicly available.

    Research areas

  • baryon acoustic oscillations, dark energy experiments, Lyman alpha forest, redshift surveys

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