학술논문
The one-dimensional Lyα forest power spectrum from BOSS
Document Type
article
Author
Palanque-Delabrouille, N; Yèche, C; Borde, A; Le Goff, JM; Rossi, G; Viel, M; Aubourg, E; Bailey, S; Bautista, J; Blomqvist, M; Bolton, A; Bolton, JS; Busca, NG; Carithers, B; Croft, RAC; Dawson, KS; Delubac, T; Font-Ribera, A; Ho, S; Kirkby, D; Lee, KG; Margala, D; Miralda-Escudé, J; Muna, D; Myers, AD; Noterdaeme, P; Pâris, I; Petitjean, P; Pieri, MM; Rich, J; Rollinde, E; Ross, NP; Schlegel, DJ; Schneider, DP; Slosar, A; Weinberg, DH
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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 and ns = 0.97 ± 0.02 based on Hi absorption in the range 2.1 < z < 3.7. © ESO, 2013.