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Journal Articles Astronomy and Astrophysics - A&A Year : 2013

The one-dimensional Lyα forest power spectrum from BOSS

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Matteo Viel
  • Function : Author
Éric Aubourg
Stephen Bailey
  • Function : Author
Michael Blomqvist
  • Function : Author
Adam Bolton
  • Function : Author
James S. Bolton
  • Function : Author
Nicolás G. Busca
Bill Carithers
  • Function : Author
Rupert A. C. Croft
  • Function : Author
Kyle S. Dawson
  • Function : Author
Andreu Font-Ribera
  • Function : Author
Shirley Ho
  • Function : Author
David Kirkby
  • Function : Author
Khee-Gan Lee
  • Function : Author
Daniel Margala
  • Function : Author
Jordi Miralda-Escudé
  • Function : Author
Demitri Muna
  • Function : Author
Adam D. Myers
  • Function : Author
Pasquier Noterdaeme
Isabelle Pâris
  • Function : Author
Patrick Petitjean
  • Function : Author
Matthew M. Pieri
  • Function : Author
Emmanuel Rollinde
Nicholas P. Ross
  • Function : Author
David J. Schlegel
  • Function : Author
Donald P. Schneider
  • Function : Author
Anže Slosar
  • Function : Author
David H. Weinberg
  • Function : Author

Abstract

We have developed two independent methods to measure the one-dimensional power spectrum of the transmitted flux in the Lyman-$\alpha$ forest. The first method is based on a Fourier transform, and the second on a maximum likelihood estimator. The two methods are independent and have different systematic uncertainties. The determination of the noise level in the data spectra was subject to a novel treatment, because of its significant impact on the derived power spectrum. We applied the two methods to 13,821 quasar spectra from SDSS-III/BOSS DR9 selected from a larger sample of over 60,000 spectra on the basis of their high quality, large signal-to-noise ratio, and good spectral resolution. The power spectra measured using either approach are in good agreement over all twelve redshift bins from $ = 2.2$ to $ = 4.4$, and scales from 0.001 $\rm(km/s)^{-1}$ to $0.02 \rm(km/s)^{-1}$. We determine the methodological and instrumental systematic uncertainties of our measurements. We provide a preliminary cosmological interpretation of our measurements using available hydrodynamical simulations. The improvement in precision over previously published results from SDSS is a factor 2--3 for constraints on relevant cosmological parameters. For a $\Lambda$CDM model and using a constraint on $H_0$ that encompasses measurements based on the local distance ladder and on CMB anisotropies, we infer $\sigma_8 =0.83\pm0.03$ and $n_s= 0.97\pm0.02$ based on \ion{H}{i} absorption in the range $2.1
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Dates and versions

cea-01135469 , version 1 (25-03-2015)

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Cite

Nathalie Palanque-Delabrouille, Christophe Yèche, Arnaud Borde, Jean-Marc Le Goff, Graziano Rossi, et al.. The one-dimensional Lyα forest power spectrum from BOSS. Astronomy and Astrophysics - A&A, 2013, 559, pp.A85. ⟨10.1051/0004-6361/201322130⟩. ⟨cea-01135469⟩
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