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26 April 2024

» arxiv » 1607.6097

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Detection of Baryon Acoustic Oscillation Features in the Large-Scale 3-Point Correlation Function of SDSS BOSS DR12 CMASS Galaxies
Zachary Slepian ; Daniel J. Eisenstein ; Joel R. Brownstein ; Chia-Hsun Chuang ; Héctor Gil-Marín ; Shirley Ho ; Francisco-Shu Kitaura ; Will J. Percival ; Ashley J. Ross ; Graziano Rossi ; Hee-Jong Seo ; Anže Slosar ; Mariana Vargas-Magaña ;
Date:	20 Jul 2016
Abstract:	We present the large-scale 3-point correlation function (3PCF) of the SDSS DR12 CMASS sample of $777,202$ Luminous Red Galaxies, the largest-ever sample used for a 3PCF or bispectrum measurement. We make the first high-significance ($4.5sigma$) detection of Baryon Acoustic Oscillations (BAO) in the 3PCF. Using these acoustic features in the 3PCF as a standard ruler, we measure the distance to $z=0.57$ to $1.7\%$ precision (statistical plus systematic). We find $D_{ m V}= 2024pm29;{ m Mpc;(stat)}pm20;{ m Mpc;(sys)}$ for our fiducial cosmology (consistent with Planck 2015) and bias model. This measurement extends the use of the BAO technique from the 2-point correlation function (2PCF) and power spectrum to the 3PCF and opens an avenue for deriving additional cosmological distance information from future large-scale structure redshift surveys such as DESI. Our measured distance scale from the 3PCF is fairly independent from that derived from the pre-reconstruction 2PCF and is equivalent to increasing the length of BOSS by roughly 10\%; reconstruction appears to lower the independence of the distance measurements. Fitting a model including tidal tensor bias yields a moderate significance ($2.6sigma)$ detection of this bias with a value in agreement with the prediction from local Lagrangian biasing.
Source:	arXiv, 1607.6097
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