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The one-dimensional Lyα forest power spectrum from BOSS

Palanque-Delabrouille, Nathalie; Yèche, Christophe; Borde, Arnaud; Le Goff, Jean-Marc; Rossi, Graziano; Viel, Matteo; Aubourg, Éric; Bailey, Stephen; Bautista, Julian; Blomqvist, Michael; Bolton, Adam; Bolton, James S.; Busca, Nicolás G.; Carithers, Bill; A. C. Croft, Rupert; Dawson, Kyle S.; Delubac, Timothée; Font-Ribera, Andreu; Ho, Shirley; Kirkby, David; Lee, Khee-Gan; Margala, Daniel; Miralda-Escudé, Jordi; Muna, Demitri; Myers, Adam D.; Noterdaeme, Pasquier; Pâris, Isabelle; Petitjean, Patrick; Pieri, Matthew M.; Rich, James; Rollinde, Emmanuel; Ross, Nicholas P.; Schlegel, David J.; Schneider, Donald P.; Slosar, Anže; Weinberg, David H.

The one-dimensional Lyα forest power spectrum from BOSS Thumbnail


Nathalie Palanque-Delabrouille

Christophe Yèche

Arnaud Borde

Jean-Marc Le Goff

Graziano Rossi

Matteo Viel

Éric Aubourg

Stephen Bailey

Julian Bautista

Michael Blomqvist

Adam Bolton

Nicolás G. Busca

Bill Carithers

Rupert A. C. Croft

Kyle S. Dawson

Timothée Delubac

Andreu Font-Ribera

Shirley Ho

David Kirkby

Khee-Gan Lee

Daniel Margala

Jordi Miralda-Escudé

Demitri Muna

Adam D. Myers

Pasquier Noterdaeme

Isabelle Pâris

Patrick Petitjean

Matthew M. Pieri

James Rich

Emmanuel Rollinde

Nicholas P. Ross

David J. Schlegel

Donald P. Schneider

Anže Slosar

David H. Weinberg


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 H I absorption in the range 2.1 < z < 3.7.


Palanque-Delabrouille, N., Yèche, C., Borde, A., Le Goff, J., Rossi, G., Viel, M., …Weinberg, D. H. (2013). The one-dimensional Lyα forest power spectrum from BOSS. Astronomy and Astrophysics, 559, Article A85.

Journal Article Type Article
Acceptance Date Sep 5, 2013
Online Publication Date Nov 19, 2013
Publication Date 2013-11
Deposit Date Jan 4, 2023
Publicly Available Date Jan 18, 2023
Journal Astronomy and Astrophysics
Print ISSN 2329-1273
Electronic ISSN 1432-0746
Publisher EDP Open
Peer Reviewed Peer Reviewed
Volume 559
Article Number A85
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL
Publisher URL


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