Tangential anisotropy in the stellar halo as a signature of tidal interactions

Sarah Loebman found from her analysis of three different suites of simulations that the velocity anisotropy of the stellar halo is expected to be very radial – except when there has been some sort of tidal interaction. This might be a new and interesting way to find recent evidence of mergers in Gaia data. The ApJ paper is hereĀ http://adsabs.harvard.edu/abs/2018ApJ…853..196L