The Clustering of Galaxies in SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Constraints on Primordial Non-Gaussianity - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2013

The Clustering of Galaxies in SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Constraints on Primordial Non-Gaussianity

A.J. Ross
  • Function : Author
Will J. Percival
  • Function : Author
Aurelio Carnero
  • Function : Author
Gong-Bo Zhao
  • Function : Author
Marc Manera
  • Function : Author
Alvise Raccanelli
  • Function : Author
E. Aubourg
Dmitry Bizyaev
Howard Brewington
  • Function : Author
J. Brinkmann
  • Function : Author
Joel R. Brownstein
  • Function : Author
Antonio J. Cuesta
  • Function : Author
Luiz A. N. da Costa
  • Function : Author
Daniel J. Eisenstein
  • Function : Author
Garrett Ebelke
  • Function : Author
Hong Guo
  • Function : Author
J.-C. Hamilton
Elena Malanushenko
  • Function : Author
Viktor Malanushenko
  • Function : Author
Claudia Maraston
  • Function : Author
Francesco Montesano
  • Function : Author
Robert C. Nichol
  • Function : Author
Daniel Oravetz
  • Function : Author
Kaike Pan
Francisco Prada
  • Function : Author
Ariel G. Sanchez
  • Function : Author
Lado Samushia
  • Function : Author
David J. Schlegel
  • Function : Author
Donald P. Schneider
  • Function : Author
Hee-Jong Seo
  • Function : Author
Alaina Sheldon
  • Function : Author
Audrey Simmons
  • Function : Author
Stephanie Snedden
  • Function : Author
Molly E. C. Swanson
  • Function : Author
Daniel Thomas
  • Function : Author
Jeremy L. Tinker
  • Function : Author
Rita Tojeiro
  • Function : Author
Idit Zehavi
  • Function : Author

Abstract

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.

Dates and versions

in2p3-00742978 , version 1 (17-10-2012)

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Cite

A.J. Ross, Will J. Percival, Aurelio Carnero, Gong-Bo Zhao, Marc Manera, et al.. The Clustering of Galaxies in SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: Constraints on Primordial Non-Gaussianity. Monthly Notices of the Royal Astronomical Society, 2013, 428 (2), pp.1116-1127. ⟨10.1093/mnras/sts094⟩. ⟨in2p3-00742978⟩
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