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

我们将利用盖亚DR 2和DR 3现在可用的天体测量，光谱和/或时域数据，结合大量的地面光度和光谱调查，以表征恒星晕的轮廓，量化不同人口示踪剂中的子结构数量，在轨道空间中表征它，推断其人口和丰度特性，并且限制了原星系流的形成以及原星系流的性质（如球状星团、矮星系、盘扭曲）。此外，我们将采用广泛的双星探测银河系的（暗物质）晕属性。

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.