Filtering a periodical component of a regular fractal using speckle

Mapping Intimacies ◽

10.1117/12.281292 ◽

1997 ◽

Cited By ~ 2

Author(s):

Mario M. Lehman ◽

L. De Pasquale ◽

D. Patrignani ◽

J. L. Pombo

Keyword(s):

Periodical Component

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Traces of Anisotropic Quasi-Regular Structure in the SDSS Data

Universe ◽

10.3390/universe7080289 ◽

2021 ◽

Vol 7 (8) ◽

pp. 289

Author(s):

Andrei I. Ryabinkov ◽

Alexander D. Kaminker

Keyword(s):

Preliminary Analysis ◽

Large Scale ◽

Power Spectra ◽

Regular Structure ◽

Characteristic Scale ◽

Spherical Coordinate ◽

Luminous Red Galaxies ◽

Special Direction ◽

Red Galaxies ◽

Periodical Component

The aim of this study is to search for quasi-periodical structures at moderate cosmological redshifts z ≲ 0.5. We mainly use the SDSS DR7 data on the luminous red galaxies (LRGs)with redshifts 0.16 ≤ z ≤ 0.47. At first, we analyze features (peaks) in the power spectra of radial (shell-like) distributions using separate angular sectors in the sky and calculate the power spectra within each sector. As a result, we found some signs of a large-scale anisotropic quasi-periodic structure detectable through 6 sectors out of a total of 144 sectors. These sectors are distinguished by large amplitudes of dominant peaks in their radial power spectra at wavenumbers k within a narrow interval of 0.05 < k < 0.07 h Mpc−1. Then, passing from a spherical coordinate system to a Cartesian one, we found a special direction such that the total distribution of LRG projections on it contains a significant (≳5σ) quasi-periodical component. We assume that we are dealing with a signature of a quasi-regular structure with a characteristic scale 116 ± 10 h−1 Mpc. Our assumption is confirmed by a preliminary analysis of the SDSS DR12 data.

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