Chemo-dynamical Mapping of the Milky Way’s Outskirts (A03)

我们将利用目前可用的Gaia DR2和DR3的天体测量、光谱和/或时间域数据，结合大规模的地面光度和光谱测量，以表征恒星晕的轮廓和量化不同种群示踪器中的亚结构数量，在轨道空间中表征恒星晕，推断其种群和丰度特性，并限制原位形成以及流前体(如球状星团、矮星系、盘曲)的特性。此外，我们将使用宽双星作为银河系(暗物质)晕属性的探测器。

We will exploit the now available astrometric, spectral, and/or time-domain data of Gaia DR2 and DR3 in conjunction with massive ground-based photometric and spectroscopic surveys in order to characterize the stellar halo’s profile and quantify the amount of substructure in different population tracers, characterize it in orbital space, infer its population and abundance properties, and constrain in-situ formation as well as the properties of the stream progenitors (such as glob-ular clusters, dwarf galaxies, disk warp). Furthermore, we will employ wide binaries as probes of the Galaxy’s (dark matter) halo properties.