6533b82ffe1ef96bd129529c
RESEARCH PRODUCT
REMARKS ON THE METHODS OF INVESTIGATIONS OF ALIGNMENT OF GALAXIES
Wlodzimierz Godlowskisubject
PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)AutocorrelationFOS: Physical sciencesAstronomy and AstrophysicsExtragalactic astronomyAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsKolmogorov–Smirnov testAstrophysics - Astrophysics of GalaxiesGalaxysymbols.namesakeSpace and Planetary SciencePosition (vector)Astrophysics of Galaxies (astro-ph.GA)symbolsCluster (physics)Astrophysics::Galaxy AstrophysicsGalaxy clusterAstrophysics - Cosmology and Nongalactic AstrophysicsStatistical hypothesis testingdescription
In the 1975 Hawley and Peebles gave the proposal to use three statistical tests for investigations of the galaxies orientation in the large structures. Nowadays, it has been considered as the standard method of searching for galactic alignments. In the present paper we analyzed the tests in details and proposed a few improvements. Basing on the improvements, the new method of analysis of the alignment of galaxies in clusters is proposed. The power of this method is demonstrated on the sample of 247 Abell clusters with at least 100 objects in each. The distributions of the position angles for galaxies in each cluster are analyzed using statistical tests: $\chi^2$, Fourier, autocorrelation and Kolmogorow test. The mean value of analyzed statistics is compared with theoretical predictions as well as with results obtained from numerical simulations. We performed 1000 simulations of 247 fictious clusters, each with numbers of galaxies the same as the real ones. We found that orientations of galaxies in analyzed clusters are not random i.e. that there exists an alignment of galaxies in rich Abell galaxy clusters.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-10-10 | The Astrophysical Journal |