Anisotropy of the space orientation of radio sources. II: The axis distribution function

TL;DR

This study reveals that the axes of extended radio sources are anisotropically oriented, favoring the equatorial direction over the Celestial Pole, with a highly significant deviation from isotropy.

Contribution

It provides the first detailed analysis of the spatial orientation distribution of radio source axes, demonstrating anisotropy in their sky distribution.

Findings

Axes avoid the Celestial Pole direction

Majority of axes are oriented in the equatorial direction

Probability of isotropic distribution is less than 0.00004

Abstract

An analysis of the position angles distribution of 10461 extended radio sources shows that the spatial orientation of the axes of these objects is anisotropic: they avoid the direction towards the Celestial Pole and are mostly oriented in the equatorial direction. The ratio of the probability densities of the orientation in these two directions is 0.68. The probability that the sky distribution of axes is isotropic is less then 0.00004. This conclusion is consistent with the results of the analyses of the spatial distribution of galactic normals orientation in the galaxies from UGC, ESO and FGC catalogs