Action-space clustering on stellar stream data

Stream stars removed by tides from their progenitor satellite galaxy or globular cluster act as a group of test particles on neighbouring orbits, probing the gravitational field...经潮汐作用从其母伴星系（progenitor satellite galaxy）或球状星团（globular cluster）中剥离出的星流恒星，将作为一组沿邻近轨道运行的示踪粒子（test particles），用于探测引力场……