Neil G. Ibata

TL;DR: Radial velocity measurements reveal that the satellites in this structure have the same sense of rotation about their host, and shows conclusively that substantial numbers of dwarf satellite galaxies share the same dynamical orbital properties and direction of angular momentum.

TL;DR: In this article, Bahl and Baumgardt investigated the incidence of planar alignments of satellite galaxies in the Millennium-II simulation and concluded that vast, thin planes of dwarf galaxies, similar to that observed in the Andromeda galaxy (M31), occur frequently by chance in?-cold dark matter cosmology.

TL;DR: Measurements of the velocities of pairs of diametrically opposed satellite galaxies suggest that planes of co-rotating satellites, similar to those seen around the Andromeda galaxy, are ubiquitous, and their coherent motion suggests that they represent a substantial repository of angular momentum on scales of about 100 kiloparsecs.

TL;DR: In this article, the authors examined the correlation between the satellite pair positions and the orientation of the host galaxy major axis and found that those satellite pairs with anti-correlated velocities have a strong preference to align with the major axis of their host whereas those with correlated velocity display the opposite behavior.

TL;DR: In this paper, the authors examined the correlation between the satellite pair positions and the orientation of the host galaxy major axis and found that those satellite pairs with anti-correlated velocities have a strong preference to align with the major axis of their host whereas those with correlated velocity display the opposite behavior.