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Regarding the line-of-sight baryonic acoustic feature in the Sloan Digital Sky Survey and baryon Oscillation Spectroscopic Survey luminous red galaxy samples
List of Titles
Regarding the line-of-sight baryonic acoustic feature in the Sloan Digital Sky Survey and baryon Oscillation Spectroscopic Survey luminous red galaxy samples
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/225011
- Title
- Regarding the line-of-sight baryonic acoustic feature in the Sloan Digital Sky Survey and baryon Oscillation Spectroscopic Survey luminous red galaxy samples
- Author(s)
- Kazin, Eyal A.; Blanton, Michael R.; Scoccimarro, Roman; McBride, Cameron K.; Berlind, Andreas A.
- Abstract
- We analyze the line-of-sight baryonic acoustic feature in the two-point correlation function ξ of the Sloan Digital Sky Survey luminous red galaxy (LRG) sample (0.16 < z < 0.47). By defining a narrow line-of-sight region, rp < 5.5 h -1 Mpc, where r p is the transverse separation component, we measure a strong excess of clustering at ∼110 h -1 Mpc, 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 ACDM nonlinear 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 (BOSS) LRG volume. Mock LRG catalogs (z < 0.6) suggest that (1) the narrow line-of-sight cylinder and cone defined above probably will not reveal a detectable acoustic feature in BOSS; (2) 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; (3) 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).
- Publication type
- Journal article
- Source
- Astrophysical Journal Letters, Vol. 719, no. 2 (Aug 2010), pp. 1032-1044
- Publication year
- 2010
- FOR Code(s)
- 0201 Astronomical and Space Sciences; 0305 Organic Chemistry; 0306 Physical Chemistry (Incl. Structural)
- Keyword(s)
- Baryon Oscillation Spectroscopic Survey; cD galaxies; Cosmology observations; Distance scale; Elliptical and lenticular galaxies; Large-scale structure of universe
- Publisher
- Institute of Physics Publishing
- ISSN
- 2041-8205
- Publisher URL
- http://dx.doi.org/10.1088/0004-637x/719/2/1032
- Copyright
- Copyright © 2010 The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow Swinburne Research Bank to archive either the accepted manuscript or the published version of the article. However you can find an earlier version of the full text here: http://arxiv.org/abs/1004.2244
- Peer reviewed
