The one-dimensional Ly-alpha forest power spectrum from BOSS
Nathalie Palanque-Delabrouille, Christophe Y\`eche, Arnaud Borde,, Jean-Marc Le Goff, Graziano Rossi, Matteo Viel, \'Eric Aubourg, Stephen, Bailey, Julian Bautista, Michael Blomqvist, Adam Bolton, James S. Bolton,, Nicol\'as G. Busca, Bill Carithers, Rupert A.C. Croft

TL;DR
This paper presents two independent methods to measure the one-dimensional Ly-alpha forest power spectrum from SDSS-III/BOSS data, achieving improved precision and providing cosmological parameter constraints.
Contribution
The paper introduces two independent approaches for measuring the Ly-alpha forest power spectrum, with novel noise treatment and systematic uncertainty analysis, applied to a large quasar sample.
Findings
Good agreement between methods across redshift and scale ranges.
Achieved 2-3 times better precision than previous SDSS results.
Provided cosmological constraints on and n_s with improved accuracy.
Abstract
We have developed two independent methods to measure the one-dimensional power spectrum of the transmitted flux in the Lyman- 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 to , and scales from 0.001 to .…
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