Preferred Alignments of Angular Momentum Vector of Galaxies in the SDSS Supercluster S[231+030+0117]

  • Janak Ratna Malla Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu
  • Walter Saurer Institute of Astro-particle Physics, Innsbruck University
  • Binil Aryal Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu
Keywords: Evolution, Galaxies, Orientation, Substructure, Supercluster

Abstract

The distribution of angular momentum vectors of 1,172 galaxies in the Supercluster S[231+030+0117] with redshift in the range 0.107 to 0.123 was studied. Present work aimed to check any deviation from isotropic distribution in the galaxy orientation study and interpret those deviations with the existing theoretical models that describe galaxy evolution in the Superclusters. For this purpose, two-dimensional observed parameters received from the SDSS telescope was transformed into the three-dimensional. Random simulation technique was applied to remove the selection effects in our database and obtain the expected isotropic curves using numerical simulation. Then the observed and expected distribution curves were compared using the three statistical tests namely: Chi-square, Auto-correlation, and the Fourier test. From statistical analysis, the study confirm that the evolution of galaxies in the Supercluster supports the `Hierarchy model' suggesting the angular momentum vectors of galaxies tends to be oriented randomly to the equatorial coordinate system. Besides, the magnitude of galaxies was found to be independent of angular momentum vectors and its projections in the Supercluster.

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Abstract
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Published
2020-12-25
How to Cite
Malla, J., Saurer, W., & Aryal, B. (2020). Preferred Alignments of Angular Momentum Vector of Galaxies in the SDSS Supercluster S[231+030+0117]. Journal of Institute of Science and Technology, 25(2), 72-79. Retrieved from https://www.nepjol.info/index.php/JIST/article/view/33743
Section
Research Article