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The Clustering of Galaxies in SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Constraints on Primordial Non-Gaussianity
Ross A.J., Percival W. J., Carnero A., Zhao G.-B., Manera M. et al
Monthly Notices of the Royal Astronomical Society 428 (2013) 1116-1127 - http://hal.in2p3.fr/in2p3-00742978
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
The Clustering of Galaxies in SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Constraints on Primordial Non-Gaussianity
A.J. Ross, Will J. Percival, Aurelio Carnero, Gong-Bo Zhao, Marc Manera, Alvise Raccanelli, E. Aubourg1, 2, Dmitry Bizyaev, Howard Brewington, J. Brinkmann, Joel R. Brownstein, Antonio J. Cuesta, Luiz A. N. Da Costa, Daniel J. Eisenstein, Garrett Ebelke, Hong Guo, J.-C. Hamilton1, M. Vargas Magana1, Elena Malanushenko, Viktor Malanushenko, Claudia Maraston, Francesco Montesano, Robert C. Nichol, Daniel Oravetz, Kaike Pan, Francisco Prada, Ariel G. Sanchez, Lado Samushia, David J. Schlegel, Donald P. Schneider, Hee-Jong Seo, Alaina Sheldon, Audrey Simmons, Stephanie Snedden, Molly E. C. Swanson, Daniel Thomas, Jeremy L. Tinker, Rita Tojeiro, Idit Zehavi
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
http://www.apc.univ-paris7.fr/
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
France
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
CEA : DSM/IRFU
France
APC - Cosmologie et Gravitation
We analyze the density field of 264,283 galaxies observed by the Sloan Digital Sky Survey (SDSS)-III Baryon Oscillation Spectroscopic Survey (BOSS) and included in the SDSS data release nine (DR9). In total, the SDSS DR9 BOSS data includes spectroscopic redshifts for over 400,000 galaxies spread over a footprint of more than 3,000 deg^2. We measure the power spectrum of these galaxies with redshifts 0.43 < z < 0.7 in order to constrain the amount of local non-Gaussianity, f_NL,local, in the primordial density field, paying particular attention to the impact of systematic uncertainties. The BOSS galaxy density field is systematically affected by the local stellar density and this influences the ability to accurately measure f_NL,local. In the absence of any correction, we find (erroneously) that the probability that f_NL,local is greater than zero, P(f_NL,local >0), is 99.5%. After quantifying and correcting for the systematic bias and including the added uncertainty, we find -92 < f_NL,local < 398 at 95% confidence, and P(f_NL,local >0) = 91.0%. A more conservative approach assumes that we have only learned the k-dependence of the systematic bias and allows any amplitude for the systematic correction; we find that the systematic effect is not fully degenerate with that of f_NL,local, and we determine that -168 < f_NL,local < 364 (at 95% confidence) and P(f_NL,local >0) = 68%. This analysis demonstrates the importance of accounting for the impact of Galactic foregrounds on f_NL,local measurements. We outline the methods that account for these systematic biases and uncertainties. We expect our methods to yield robust constraints on f_NL,local for both our own and future large-scale-structure investigations.
SDSS-III

Articles dans des revues avec comité de lecture
01/2013
Monthly Notices of the Royal Astronomical Society
Publisher Oxford University Press (OUP): Policy P - Oxford Open Option A
ISSN 0035-8711 (eISSN : 1365-8711)
428
1116-1127
© 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

12 pages, 7 figures
Astrophysics - Cosmology and Extragalactic Astrophysics
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1208.1491