THE BARYONIC ACOUSTIC FEATURE AND LARGE-SCALE CLUSTERING IN THE SLOAN DIGITAL SKY SURVEY LUMINOUS RED GALAXY SAMPLE
- Center for Cosmology and Particle Physics, New York University, 4 Washington Place, New York, NY 10003 (United States)
- Department of Physics and Astronomy, Vanderbilt University, 1807 Station B, Nashville, TN 37235 (United States)
- Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
- Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349 (United States)
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States)
- Particle Astrophysics Center, Fermilab, P.O. Box 500, Batavia, IL 60510 (United States)
- MS 127, Fermilab, P.O. Box 500, Batavia, IL 60510 (United States)
- Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802 (United States)
We examine the correlation function xi of the Sloan Digital Sky Survey Luminous Red Galaxy sample at large scales (60 h {sup -1} Mpc < s < 400 h {sup -1} Mpc) using the final data release (DR7). Focusing on a quasi-volume-limited (0.16 < z < 0.36) subsample and utilizing mock galaxy catalogs, we demonstrate that the observed baryonic acoustic peak and larger scale signal are consistent with LAMBDACDM at 70%-95% confidence. Fitting data to a non-linear, redshift-space, template-based model, we constrain the peak position at s{sub p} = 101.7+- 3.0 h {sup -1} Mpc when fitting the range 60 h {sup -1} Mpc < s < 150 h {sup -1} Mpc (1sigma uncertainties). This redshift-space distance s{sub p} is related to the comoving sound horizon scale r{sub s} after taking into account matter-clustering non-linearities, redshift distortions, and galaxy-clustering bias. Mock catalogs show that the probability that a DR7-sized sample would not have an identifiable peak is at least {approx}10%. As a consistency check of a fiducial cosmology, we use the observed s{sub p} to obtain the distance D{sub V}{identical_to}((1+z){sup 2}D{sup 2}{sub A}cz/H(z)){sup 1/3} relative to the acoustic scale. We find r{sub s} /D{sub V} (z = 0.278) = 0.1389 +- 0.0043. This result is in excellent agreement with Percival et al., who examine roughly the same data set, but use the power spectrum. Comparison with other determinations in the literature are also in very good agreement. The signal of the full sample at 125 h {sup -1} Mpc < s < 200 h {sup -1} Mpc tends to be high relative to theoretical expectations; this slight deviation can probably be attributed to sample variance. We have tested our results against a battery of possible systematic effects, finding all effects are smaller than our estimated sample variance.
- OSTI ID:
- 21394423
- Journal Information:
- Astrophysical Journal, Vol. 710, Issue 2; Other Information: DOI: 10.1088/0004-637X/710/2/1444; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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