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A Study of Spatial Orientation of SDSS Galaxies in Saraswati Supercluster

Author(s) Dr. Shiv Narayan Yadav, Mr. Birendra Prasad Yadav
Country Nepal
Abstract We present an investigation of spatial orientations of SDSS galaxies of Saraswati Supercluster using 15th data release (DR15) galaxies. The major goal of this study is to test nonrandom effect on spin angular momentum of galaxies within the given right ascension and declination limit in the framework of three alternative scenarios ‘Hierarchy model’, ‘Pancake model’ and the ‘Primordial vorticity model’. Using the ‘position angle -inclination’ method, two-dimensional observable data (positions, position angles, and inclination angles) are translated into three-dimensional rotation axes (polar and azimuthal angles) of the galaxy. By removing the selection effects and running a random simulation with 107 virtual galaxies, the predicted isotropy distribution curves have been identified. Three statistical tests are used to compare the observed and expected distributions: Chi-square, Auto-correlation, and Fourier. The entire database is divided into nine samples. Some of our findings support the Hierarchy concept and some results support the Pancake model.
Here, we noticed the value of first order fourier coefficient increases as the distance from the centre of Supercluster increases. This indicates multipole i.e. several centre of gravity which shows the structure is less virial.
Field Physics > Astronomy
Published In Volume 7, Issue 5, May 2026
Published On 2026-05-10
DOI https://doi.org/10.70528/IJLRP.v7.i5.2166
Short DOI https://doi.org/hb379w
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