SgrA* orbital motions with GRAVITY

We report the detection of continuous positional and polarization changes of the compact source SgrA* in high states ('flares') of its variable near- infrared emission with the...我们报道了致密源人马座A*（SgrA*）在其可变近红外辐射处于高态（耀斑）时的连续位置与偏振变化的探测结果。