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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
| Content Provider | Scilit |
|---|---|
| Author | Kazin, Eyal A. Blanton, Michael R. Scoccimarro, Román McBride, Cameron K. Berlind, Andreas A. |
| Copyright Year | 2010 |
| Description | Journal: The Astrophysical Journal 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, $r_{p}$ < 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 ΛCDM 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 D$ _{A}$(z). |
| Related Links | http://iopscience.iop.org/article/10.1088/0004-637X/719/2/1032/pdf |
| Ending Page | 1044 |
| Page Count | 13 |
| Starting Page | 1032 |
| ISSN | 0004637X |
| DOI | 10.1088/0004-637x/719/2/1032 |
| Journal | The Astrophysical Journal |
| Issue Number | 2 |
| Volume Number | 719 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2010-07-26 |
| Access Restriction | Open |
| Subject Keyword | Journal: The Astrophysical Journal Astronomy and Astrophysics Acoustic Feature Line of Sight Baryon Oscillation Spectroscopic Survey Oscillation Spectroscopic |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
