A study of orientation spin vector of g- magnitude of SDSS DR-13 galaxies having redshift 0.50 to 0.53

Abstract

With a focus on galaxies with redshifts between 0.50 and 0.53 we have studied the spatial alignment of 106,019 galaxies surveyed by the Sloan Digital Sky Survey (SDSS). The SDSS telescope in New Mexico USA was equipped with a 447 nm Charged Coupled Device (CCD) filter to record the g-magnitudes. We transformed two-dimensional given constraints into three-dimensional parameters, polar and azimuthal angle. In order to ascertain the theoretical isotropic distribution of galaxy rotation axes while taking into account different selection effects we conducted random simulations by creating 10⁷ virtual galaxies using the methodology described by earlier studies. Chi-square, autocorrelation, and Fourier analysis were the three statistical tests we used to examine the differences between the theoretical and observed distributions. The main goals are to investigate non-random effects in galaxy orientations and evaluate how well the selected coordinate system explains the actual orientation of far-off galaxies. Our results show that the spin vectors in samples g01, g02, g05, and g06 have an isotropic distribution which is consistent with the Hierarchy Model of galaxy evolution. The reference coordinate system is the cause of the controversy for few samples. Additionally, g07 has a significant negative value consistent with the Primordial Vorticity Model while go3 and go4 have significant positive first order Fourier coefficients supporting the Pancake model.