DOI: 10.5281/zenodo.17144753
title: Dataset for Probing large-scale structures with the 2-point function and the power spectrum: insights into cosmic clustering evolution

description: This repository contains the dataset used in the paper:



Franco, Camila; Avila, Felipe; Bernui, Armando (2025), Probing large-scale structures with the 2-point function and the power spectrum: insights into cosmic clustering evolution.


 

Repository structureThe data are organized into two main directories:raw/└── Table_star_forming_galaxies.csv

processed/├── a1/│ ├── sdss_blue_RA_117-157_DEC_48-64_z_0.00-0.06.dat│ └── sdss_blue_RA_117-157_DEC_48-64_z_0.06-0.12.dat├── a2/│ ├── sdss_blue_RA_117-157_DEC_32-48_z_0.00-0.06.dat│ └── sdss_blue_RA_117-157_DEC_32-48_z_0.06-0.12.dat├── a3/│ ├── sdss_blue_RA_117-157_DEC_16-32_z_0.00-0.06.dat│ └── sdss_blue_RA_117-157_DEC_16-32_z_0.06-0.12.dat├── a4/│ ├── sdss_blue_RA_122-157_DEC_0-16_z_0.00-0.06.dat│ └── sdss_blue_RA_122-157_DEC_0-16_z_0.06-0.12.dat├── a5/│ ├── sdss_blue_RA_157-197_DEC_48-64_z_0.00-0.06.dat│ └── sdss_blue_RA_157-197_DEC_48-64_z_0.06-0.12.dat├── a6/│ ├── sdss_blue_RA_157-197_DEC_32-48_z_0.00-0.06.dat│ └── sdss_blue_RA_157-197_DEC_32-48_z_0.06-0.12.dat├── a7/│ ├── sdss_blue_RA_157-197_DEC_16-32_z_0.00-0.06.dat│ └── sdss_blue_RA_157-197_DEC_16-32_z_0.06-0.12.dat├── a8/│ ├── sdss_blue_RA_157-197_DEC_0-16_z_0.00-0.06.dat│ └── sdss_blue_RA_157-197_DEC_0-16_z_0.06-0.12.dat├── a9/│ ├── sdss_blue_RA_197-237_DEC_48-64_z_0.00-0.06.dat│ └── sdss_blue_RA_197-237_DEC_48-64_z_0.06-0.12.dat├── a10/│ ├── sdss_blue_RA_197-237_DEC_32-48_z_0.00-0.06.dat│ └── sdss_blue_RA_197-237_DEC_32-48_z_0.06-0.12.dat├── a11/│ ├── sdss_blue_RA_197-237_DEC_16-32_z_0.00-0.06.dat│ └── sdss_blue_RA_197-237_DEC_16-32_z_0.06-0.12.dat└── a12/├── sdss_blue_RA_197-237_DEC_0-16_z_0.00-0.06.dat└── sdss_blue_RA_197-237_DEC_0-16_z_0.06-0.12.dat



raw → Contains the initial catalogue of star-forming galaxies from SDSS.

processed → Contains the subsets of blue galaxies used in the analysis.  - Each subdirectory (`a1/`, `a2/`,...) corresponds to a different sky region.  - Each region contains two files, representing two redshift shells:    - `z_0.00-0.06` (Shell 1)    - `z_0.06-0.12` (Shell 2)


 

File format and columns1. Id_SDSS_spec_DR8** – Spectroscopic identifier in SDSS DR8  2. RA – Right Ascension (degrees)  3. DEC – Declination (degrees)  4. Abs_u – Absolute magnitude in u band  5. Error_Abs_u – Uncertainty in Abs_u  6. Abs_u_intrinsic_ext_corr – u-band absolute magnitude corrected for intrinsic extinction  7. Error_Abs_u_intrinsic_ext_corr – Uncertainty of the extinction-corrected u value  8. Abs_g – Absolute magnitude in g band  9. Error_Abs_g – Uncertainty in Abs_g  10. Abs_g_intrinsic_ext_corr – g-band absolute magnitude corrected for intrinsic extinction  11. Error_Abs_g_intrinsic_ext_corr – Uncertainty of the extinction-corrected g value  12. Abs_r – Absolute magnitude in r band  13. Error_Abs_r – Uncertainty in Abs_r  14. Abs_r_intrinsic_ext_corr – r-band absolute magnitude corrected for intrinsic extinction  15. Error_Abs_r_intrinsic_ext_corr – Uncertainty of the extinction-corrected r value  16. Abs_i – Absolute magnitude in i band  17. Abs_i_intrinsic_ext_corr – i-band absolute magnitude corrected for intrinsic extinction  18. Error_Abs_i_intrinsic_ext_corr – Uncertainty of the extinction-corrected i value  19. Abs_z – Absolute magnitude in z band  20. Abs_z_intrinsic_ext_corr – z-band absolute magnitude corrected for intrinsic extinction  21. Error_Abs_z_intrinsic_ext_corr – Uncertainty of the extinction-corrected z value  22. Redshift – Spectroscopic redshift  23. Error_Redshift – Uncertainty in redshift  

The `Table_star_forming_galaxies.csv` file in the `raw/` directory contains the parent sample of galaxies, from which the blue galaxies subsamples were derived.

The datasets were extracted from the Sloan Digital Sky Survey (SDSS), applying specific criteria for blue star-forming galaxies, as detailed in the paper. This repository does not contain the full SDSS catalogue, but only the subsets used in the analysis.