论文标题
用Gaia宽二进制限制暗物质子结构
Constraining Dark Matter Substructure With Gaia Wide Binaries
论文作者
论文摘要
我们使用具有盖亚卫星标识的恒星二进制文件的目录，以限制银河系中扩展子结构的存在。通过重复相遇与子结构的重复相遇会导致二元分离的特征分布，从而使约束的特征分布，从而独立于宽二进制的形成机理。在各种Subhalo密度轮廓中，我们表明具有质量的Subhalos $ \ gtrsim 65 \ m_ \ odot $和特征长度尺度类似于这些宽的二进制文件的分离，不能占银河系暗物质的100％。限制因较大长度尺度的Subhalos削弱，并取决于其密度曲线。对于如此庞大的苏巴尔，较高的中央密度会带来更强的限制。与冷暗物质预期的密度曲线相似的subhalos必须至少$ \ sim 5,000 $ p的密度比模拟所预测的宽度二进制目录所预测的。
We use a catalogue of stellar binaries with wide separations (up to 1 pc) identified by the Gaia satellite to constrain the presence of extended substructure within the Milky Way galaxy. Heating of the binaries through repeated encounters with substructure results in a characteristic distribution of binary separations, allowing constraints to be placed independent of the formation mechanism of wide binaries. Across a wide range of subhalo density profiles, we show that subhalos with masses $\gtrsim 65 \ M_\odot$ and characteristic length scales similar to the separation of these wide binaries cannot make up 100% of the Galaxy's dark matter. Constraints weaken for subhalos with larger length scales and are dependent on their density profiles. For such large subhalos, higher central densities lead to stronger constraints. Subhalos with density profiles similar to those expected from cold dark matter must be at least $\sim 5,000$ times denser than predicted by simulation to be constrained by the wide binary catalogue.
