Spatial orientations of angular momentum vectors of galaxies in Supercluster S [173+014+0082]

Janak Ratna Malla; Walter Saurer; B Aryal

doi:10.3126/bibechana.v18i1.29165

Janak Ratna Malla Central Department of Physics, Kirtipur, Kathmandu https://orcid.org/0000-0002-9035-1378
Walter Saurer Institute of Astro-particle Physics, Innsbruck University
B Aryal Central Department of Physics, Kirtipur, Kathmandu

DOI: https://doi.org/10.3126/bibechana.v18i1.29165

Keywords: SDSS, Supercluser, Galaxy, Redshift, Intrinsic flatness

Abstract

The spin vector orientation of 1302 SDSS (Sloan Digital Sky Survey) galaxies in Supercluster S[173+014+0082] having redshift 0.076 to 0.091 has been analyzed. The positions, position angles, and inclination angles of galaxies are used to convert two-dimensional observed parameters into three-dimensional angular momentum vectors of the galaxy using the `position angle-inclination' method. The expected isotropic distribution curves are determined by performing numerical simulation by generating 107 virtual galaxies. The observed distribution is compared with the expected isotropic distribution curves using three statistical tools namely Chi-square test, autocorrelation test, and Fourier test. Redshift map is studied and found that the distributions fit with the Gaussian. No preferred alignment of angular momentum vectors is noticed, supporting the Hierarchy model of galaxy formation.

BIBECHANA 18 (1) (2021) 26-32

Downloads

Download data is not yet available.

Abstract
87

pdf
51

Author Biography

B Aryal, Central Department of Physics, Kirtipur, Kathmandu

Binil Aryal is a professor of physics at Central Department of Physics, Tribhuvan University.