Publication at Faculty of Mathematics and Physics |
2020
Abstract
We study the correlation of orbital poles of the 11 classical satellite galaxies of theMilkyWay, comparing results from previous proper motions with the independent data by Gaia DR2. Previous results on the degree of correlation and its significance are confirmed by the new data.
Amajority of the satellites co-orbit along theVast Polar Structure, the plane (or disc) of satellite galaxies defined by their positions. The orbital planes of eight satellites align to 3 combined orbital poles, indicating that these results are not affected by a look-elsewhere effect.
This compounds the Planes of Satellite Galaxies Problem.