Spatial orientation of angular momentum vectors of galaxies in six rotating clusters

Aryal, B.; Bhattarai, Hari Datta; Dhakal, Sagar; Rajbahak, C.; Saurer, W.

doi:10.1093/mnras/stt1124

Cited by 10 publications

(11 citation statements)

References 50 publications

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“…Our preliminary analysis of the sample of 247 Abell cluster shows that in the case of χ 2 and Kolmogorov? -Smirnov tests (Godłowski (2012), Aryal et al (2013)), the analysed statistics decreases with z. Unfortunately this effect is not significant since parameter t = a/σ(a) is less then 1.…”

Section: Distribution Function Of Angular Momentamentioning

confidence: 93%

The non-Gaussian distribution of galaxy gravitational fields

Stephanovich

Godlowski

2017

Res. Astron. Astrophys.

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We perform a theoretical analysis of the observational dependence between angular momentum of the galaxy clusters and their mass (richness), based on the method introduced in our previous paper. For that we obtain the distribution function of astronomical objects (like galaxies and/or smooth halos of different kinds) gravitational fields due to their tidal interaction. Within the statistical method of Chandrasekhar we are able to show that the distribution function is determined by the form of interaction between objects and for multipole (tidal) interaction it is never Gaussian. Our calculation permits to demonstrate how the alignment of galaxies angular momenta depend on the cluster richness. The specific form of the corresponding dependence is due to assumptions made about cluster morphology. Our approach also predicts the time evolution of stellar objects angular momenta within CDM and ΛCDM models. Namely, we have shown that angular momentum of galaxies increases with time.

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Section: Distribution Function Of Angular Momentamentioning

confidence: 93%

The non-Gaussian distribution of galaxy gravitational fields

Stephanovich

Godlowski

2017

Res. Astron. Astrophys.

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“…In general, our results support Hierarchy model. The spatial orientation of galaxies in 117 clusters were studied till date 12,13,14,15,16,17,18,19,20,21 . In most cases no preferred alignment is noticed (Hierarchy model).…”

Section: Resultsmentioning

confidence: 99%

A Study of R-Magnitude Dependence in Spatial Orientation of Spin Vectors of SDSS DR-7 Galaxies of Redshift 0.10 < Z < 0.11

Yadav¹

2020

Sci World

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We present a study of spin vector orientations of 44749 r-magnitude SDSS (Sloan Digital Sky Survey) galaxies having redshift 0.10 to 0.11. The r -magnitudes are observed through 616.5 nm CCD (charge coupled device) filter attached to SDSS telescope located at New Mexico, USA. We have converted two dimensional data to three dimensional galaxy rotation axes. Our aim is to find out non-random effects in the spatial orientation of galaxies. In addition, we wanted to check r-magnitude dependence in the spatial orientation. The expected isotropy distribution curves are obtained by removing the selection effects and performing a random simulation method. In general, spin vector orientations of galaxies is found to be random, supporting Hierarchy model of galaxy formation. A local anisotropy is observed in few samples suggesting a gravitational tidal interaction between neighbor galaxies.

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“…In order words, these vectors should align randomly. The spatial orientation of galaxies in 112 clusters was studied to date (Godlowski et al, 1994;Flin et al, 2001, Aryal et al, 2013, 2010.…”

Section: Fig 1 An Arrow Represents the Preferred Direction Of Thementioning

confidence: 99%

Study of Spatial Orientation of Angular Momentum of z-Magnitude SDSS DR-13 Galaxies with Red Shift 0.50 to 0.53

Yadav

Sah

2021

J. Inst. Sci. Tech.

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The spatial orientations of 142,929 SDSS DR-13, z- magnitude galaxies having red shift 0.50 to 0.53 have been analyzed. The main goal of this work is to examine the orientation of the angular momentum of galaxies within the given redshift limit in the framework of three different scenarios 'Hierarchy model', 'Pancake model', and the 'Primordial vorticity model'. By using Godlowskian transformation the two-dimensional data were converted into three-dimensional data (polar and azimuthal angles). The expected isotropy distribution curves were obtained by removing the selection effects and performing a random simulation to generate 107 virtual galaxies by using Matlab 2015a. Three statistical tests of Chi-square, autocorrelation, and Fourier were used to compare the expected isotropic data with observed. The data classified into nine subsamples having each of one magnitude size. In general, the results supported the Hierarchy model. The model advocates random orientations of angular. However, a local anisotropy observed in few subsamples suggested a gravitational tidal interaction between neighboring galaxies, an early-merging process in which the angular momentum vector distorts the initial alignment of nearby galaxies.

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Spatial orientation of angular momentum vectors of galaxies in six rotating clusters

Cited by 10 publications

References 50 publications

The non-Gaussian distribution of galaxy gravitational fields

The non-Gaussian distribution of galaxy gravitational fields

A Study of R-Magnitude Dependence in Spatial Orientation of Spin Vectors of SDSS DR-7 Galaxies of Redshift 0.10 < Z < 0.11

Study of Spatial Orientation of Angular Momentum of z-Magnitude SDSS DR-13 Galaxies with Red Shift 0.50 to 0.53

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