Quasi-periodical features in the distribution of Luminous Red Galaxies

Abstract

A statistical analysis of radial distributions of Luminous Red Galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS DR7) catalogue within an interval $0.16\le z\le 0.47$ is carried out. We found that the radial distribution of $\sim$ 106,000 LRGs incorporates a few quasi-periodical components relatively to a variable $\eta$, dimensionless line-of-sight comoving distance calculated for the $\Lambda$CDM cosmological model. The most significant peaks of the power spectra are obtained for two close periodicities corresponding to the spatial comoving scales $(135\pm 12)h^{-1}$ Mpc and $(101\pm 6)h^{-1}$ Mpc. The latter one is dominant and consistent with the characteristic scale of the baryon acoustic oscillations. We analyse also the radial distributions of two other selected LRG samples: $\sim$ 33,400 bright LRGs ($-23.2<M\le -21.8$) and $\sim$ 60,300 all LRGs within a rectangle region on the sky, and show differences of the quasi-periodical features characteristic for different samples. Being confirmed the results would allow to give preference of the spatial against temporal models which could explain the quasi-periodicities discussed here. As a caveat we show that estimations of the significance levels of the peaks strongly depend on a smoothed radial function (trend) as well as characteristics of random fluctuations.

12 pages, 8 figures. To be published in ApSS. Comments are welcome

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• Search for a possible quasi-periodic structure based on data of the SDSS DR12 LOWZ
• Power-spectrum simulations of radial redshift distributions
• Traces of Anisotropic Quasi-Regular Structure in the SDSS Data