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Journal Articles Journal of Cosmology and Astroparticle Physics Year : 2013

Measurement of baryon acoustic oscillations in the Lyman-α forest fluctuations in BOSS data release 9

Anže Slosar
  • Function : Author
Vid Iršič
  • Function : Author
David Kirkby
  • Function : Author
Stephen Bailey
  • Function : Author
Timothée Delubac
  • Function : Author
James Rich
  • Function : Author
É. Aubourg
J.E. Bautista
Vaishali Bhardwaj
  • Function : Author
Michael Blomqvist
  • Function : Author
Adam S. Bolton
  • Function : Author
Jo Bovy
  • Function : Author
Joel Brownstein
  • Function : Author
Bill Carithers
  • Function : Author
Rupert A. C. Croft
  • Function : Author
Kyle S. Dawson
  • Function : Author
Andreu Font-Ribera
  • Function : Author
J.-M. Le Goff
  • Function : Author
Shirley Ho
  • Function : Author
Klaus Honscheid
  • Function : Author
Khee-Gan Lee
  • Function : Author
Daniel Margala
  • Function : Author
Patrick Mcdonald
  • Function : Author
Bumbarija Medolin
  • Function : Author
Jordi Miralda-Escudé
  • Function : Author
Adam D. Myers
  • Function : Author
Robert C. Nichol
  • Function : Author
Pasquier Noterdaeme
Nathalie Palanque-Delabrouille
  • Function : Author
Isabelle Pâris
  • Function : Author
  • PersonId : 973398
Patrick Petitjean
  • Function : Author
Matthew M. Pieri
  • Function : Author
Yodovina Piškur
  • Function : Author
Natalie A. Roe
  • Function : Author
Nicholas P. Ross
  • Function : Author
Graziano Rossi
  • Function : Author
David J. Schlegel
  • Function : Author
Donald P. Schneider
  • Function : Author
Nao Suzuki
  • Function : Author
Erin S. Sheldon
  • Function : Author
Uroš Seljak
  • Function : Author
Matteo Viel
  • Function : Author
David H. Weinberg
  • Function : Author
Christophe Yèche
  • Function : Author

Abstract

We use the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 9 (DR9) to detect and measure the position of the Baryonic Acoustic Oscillation (BAO) feature in the three-dimensional correlation function in the Lyman-α flux fluctuations at a redshift zeff = 2.4. The feature is clearly detected at significance between 3 and 5 sigma (depending on the broadband model and method of error covariance matrix estimation) and is consistent with predictions of the standard ΛCDM model. We assess the biases in our method, stability of the error covariance matrix and possible systematic effects. We fit the resulting correlation function with several models that decouple the broadband and acoustic scale information. For an isotropic dilation factor, we measure 100 × (αiso ‑ 1) = ‑1.6+2.0 +4.3 +7.4‑2.0 ‑4.1 ‑6.8 (stat.) ±1.0 (syst.) (multiple statistical errors denote 1,2 and 3 sigma confidence limits) with respect to the acoustic scale in the fiducial cosmological model (flat ΛCDM with Ωm = 0.27, h = 0.7). When fitting separately for the radial and transversal dilation factors we find marginalised constraints 100 × (α|| ‑ 1) = ‑1.3+3.5 +7.6 +12.3‑3.3 ‑6.7 ‑10.2 (stat.) ±2.0 (syst.) and 100 × (α⊥ ‑ 1) = ‑2.2+7.4 +17‑7.1 ‑15 (stat.) ±3.0 (syst.). The dilation factor measurements are significantly correlated with cross-correlation coefficient of ~ ‑0.55. Errors become significantly non-Gaussian for deviations over 3 standard deviations from best fit value. Because of the data cuts and analysis method, these measurements give tighter constraints than a previous BAO analysis of the BOSS DR9 Lyman-α sample, providing an important consistency test of the standard cosmological model in a new redshift regime.

Dates and versions

in2p3-00823682 , version 1 (17-05-2013)

Identifiers

Cite

Anže Slosar, Vid Iršič, David Kirkby, Stephen Bailey, N.G. Busca, et al.. Measurement of baryon acoustic oscillations in the Lyman-α forest fluctuations in BOSS data release 9. Journal of Cosmology and Astroparticle Physics, 2013, 04, pp.026. ⟨10.1088/1475-7516/2013/04/026⟩. ⟨in2p3-00823682⟩
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