151. The one-dimensional Lyα forest power spectrum from BOSS
- Author
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Palanque-Delabrouille, Nathalie, Yeche, Christophe, Borde, Arnaud, Jean-Marc Le Goff, Rossi, Graziano, Viel, Matteo, Aubourg, Eric, Bailey, Stephen, Bautista, Julian, Blomqvist, Michael, Bolton, Adam, Bolton, James S., Busca, Nicolas G., Carithers, Bill, Croft, Rupert, Dawson, Kyle S., Timothee Delubac, Font-Ribera, Andreu, Ho, Shirley Chan Wan, Kirkby, David, Khee-Gan Lee, Margala, Daniel, Miralda-Escude, Jordi, Demitri Muna, Myers, Adam D., Pasquier Noterdaeme, Paris, Isabelle, Petitjean, Patrick, Pieri, Matthew M., and Rich, James
- Subjects
FOS: Physical sciences ,20399 Classical Physics not elsewhere classified - Abstract
We have developed two independent methods for measuring the one-dimensional power spectrum of the transmitted flux in the Lyman-α 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. Determination of the noise level in the data spectra was subject to a new 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, high signal-to-noise ratio (S/N), and good spectral resolution. The power spectra measured using either approach are in good agreement over all twelve redshift bins from ⟨z⟩ = 2.2 to ⟨z⟩ = 4.4, and scales from 0.001 km s-1 to 0.02 km s-1. We determined the methodological andinstrumental 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 ΛCDM model and using a constraint on H0 that encompasses measurements based on the local distance ladder and on CMB anisotropies, we infer σ8 = 0.83 ± 0.03 andns = 0.97 ± 0.02 based on H i absorption in the range 2.1 < z < 3.7.
- Published
- 2013
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