Regarding the Line-of-Sight Baryonic Acoustic Feature in the Sloan Digital Sky Survey and Baryon Oscillation Spectroscopic Survey Luminous Red Galaxy Samples

Abstract

We analyze the line-of-sight baryonic acoustic feature in the two-point correlation function ξ of the Sloan Digital Sky Survey (SDSS) luminous red galaxy (LRG) sample (0.16 < z < 0.47). By defining a narrow line-of-sight region, rp < 5.5 Mpc/h, where rp is the transverse separation component, we measure a strong excess of clustering at ~ 110 Mpc/h, as previously reported in the literature. We also test these results in an alternative coordinate system, by defining the line-of-sight as θ < 3°, where θ is the opening angle. This clustering excess appears much stronger than the feature in the better-measured monopole. A fiducial ΛCDM non-linear model in redshift-space predicts a much weaker signature. We use realistic mock catalogs to model the expected signal and noise. We find that the line-of-sight measurements can be explained well by our mocks as well as by a featureless ξ = 0. We conclude that there is no convincing evidence that the strong clustering measurement is the line-of-sight baryonic acoustic feature. We also evaluate how detectable such a signal would be in the upcoming Baryon Oscillation Spectroscopic Survey LRG volume (BOSS). Mock LRG catalogs (z < 0.6) suggest that: (i) the narrow line- of-sight cylinder and cone defined above probably will not reveal a detectable acoustic feature in BOSS; (ii) a clustering measurement as high as that in the current sample can be ruled out (or confirmed) at a high confidence level using a BOSS-sized data set; and (iii) an analysis with wider angular cuts, which provide better signal-to-noise ratios, can nevertheless be used to compare line-of-sight and transverse distances, and thereby constrain the expansion rate H(z) and diameter distance DA(z).

12 double-column pages of Text, 6 Figures, 2 Tables

References in corpus (16)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data Release 7 Galaxy Sample
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
• The WiggleZ Dark Energy Survey: Survey Design and First Data Release
• Improving Cosmological Distance Measurements by Reconstruction of the Baryon Acoustic Peak
• Cosmological Constraints from the Clustering of the Sloan Digital Sky Survey DR7 Luminous Red Galaxies
• The Baryonic Acoustic Feature and Large-Scale Clustering in the SDSS LRG Sample
• Large-Scale Anisotropic Correlation Function of SDSS Luminous Red Galaxies
• Cosmological baryonic and matter densities from 600,000 SDSS Luminous Red Galaxies with photometric redshifts
• Reconstructing Baryon Oscillations: A Lagrangian Theory Perspective
• Clustering of luminous red galaxies I: large scale redshift space distortions
• Reconstructing baryon oscillations
• The WiggleZ Dark Energy Survey: the selection function and z=0.6 galaxy power spectrum
• Anisotropic Magnification Distortion of the 3D Galaxy Correlation: I. Real Space
• Simulations of Baryon Oscillations

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