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The clustering of galaxies in the SDSS-III DR9 Baryon Oscillation Spectroscopic Survey: constraints on primordial non-Gaussianity

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Author(s)

Ashley J. Ross, Will J. Percival, Aurelio Carnero, Gong-bo Zhao, Marc Manera, Alvise Raccanelli, Eric Aubourg, Dmitry Bizyaev, Howard Brewington, J. Brinkmann, Joel R. Brownstein, Antonio J. Cuesta, Luiz A. N. da Costa, Daniel J. Eisenstein, Garrett Ebelke, Hong Guo, Jean-Christophe Hamilton, Mariana Vargas Magaña, Elena Malanushenko, Viktor Malanushenko & 19 more Claudia Maraston, Francesco Montesano, Robert C. Nichol, Daniel Oravetz, Kaike Pan, Francisco Prada, Ariel G. Sánchez, 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

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Abstract

We analyse 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 9 (DR9). In total, the SDSSDR9 BOSS data include spectroscopic redshifts for over 400 000 galaxies spread over a footprint of more than 3000 deg2. We measure the power spectrum of these galaxies with redshifts 0.43 <z <0.7in order to constrain the amount of local non-Gaussianity, f{_N_L^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{_N_L^local}. In the absence of any correction, we find (erroneously) that the probability that f{_N_L^local} is greater than zero, P(f{_N_L^local}> 0), is 99.5 per cent. After quantifying and correcting for the systematic bias and including the added uncertainty, we find - 45 <f{_N_L^local} <195 at 95 per cent confidence and P(f{_N_L^local}> 0) = 91.0 per cent. A more conservative approach assumes that we have only learnt 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{_N_L^local}, and we determine that -82 <f{_N_L^local} <178 (at 95 per cent confidence) and P(f{_N_L^local} > 0) = 68 per cent. This analysis demonstrates the importance of accounting for the impact of Galactic foregrounds on f{_N_L^local} measurements. We outline the methods that account for these systematic biases and uncertainties. We expect our methods to yield robust constraints on f{_N_L^local} for both our own and future large-scale structure investigations.
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Original languageEnglish
Pages (from-to)1116-1127
JournalMonthly Notices of the Royal Astronomical Society
Volume428
Issue number2
Early online date7 Nov 2012
DOIs
Publication statusPublished - 11 Jan 2013

    Research areas

  • Cosmology: observations (cosmology), Inflation (cosmology), Large-scale structure of Universe

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