This project involved collecting, reviewing and standardising publicly available cosmic void cata...This project involved collecting, reviewing and standardising publicly available cosmic void cata...
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Nazmus Sakib
• Jul 31
This project involved collecting, reviewing and standardising publicly available cosmic void catalogue data from DESI DR1, SDSS DR7 and SDSS DR12 sources. The raw files were examined to identify the relevant fields, catalogue structures, algorithms and available boundary information.
I developed a common data structure covering void position, redshift, comoving coordinates, effective radius, ellipticity, density contrast, significance, member-galaxy count and edge status. The data were cleaned and merged into a single table containing 200 selected cosmic voids across REVOLVER, VIDE, ZOBOV and VoidFinder catalogues.
A size-based selection method was applied to include large, medium, small and randomly selected interior voids from each catalogue group. Where edge information was available, boundary voids were excluded to maintain the quality of the selected sample.
The final package also included 19,172 member-galaxy records for 75 selected voids and boundary-surface data for 24 voids. Supporting visualisations were prepared to present the sky distribution, comoving-space distribution and member-galaxy structure of the selected voids.
Data AnalysisResearchMicrosoft ExcelpandasPythonData Visualization
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