论文标题
结构形成模型削弱了矮小星系中w imd暗物质的极限
Structure Formation Models Weaken Limits on WIMP Dark Matter from Dwarf Spheroidal Galaxies
论文作者
论文摘要
在光晕子结构中形成的矮球星系对暗物质歼灭提供了严格的约束。通过现代调查发现的许多超级矮人对这些限制产生了重大贡献。目前，由于缺乏超级范围的恒星运动学数据，通常是针对密度剖面参数做出的非信息的先验假设。基于暗物质Subhalos的半分析模型及其与卫星星系的联系，我们提出了更有信息和逼真的卫星先验。我们表明，我们的卫星先验会导致对歼灭速率的限制，该灭绝率在2倍（比非信息性先验）较弱的百分比之间。结果，对于$ \ lyssim的暗物质质量40 $ gev的暗物质质量，最多只能排除（概率为95％），从矮球球数据中，假设将nih灭成$ b \ bar {b} $。
Dwarf spheroidal galaxies that form in halo substructures provide stringent constraints on dark matter annihilation. Many ultrafaint dwarfs discovered with modern surveys contribute significantly to these constraints. At present, because of the lack of abundant stellar kinematic data for the ultrafaints, non-informative prior assumptions are usually made for the parameters of the density profiles. Based on semi-analytic models of dark matter subhalos and their connection to satellite galaxies, we present more informative and realistic satellite priors. We show that our satellite priors lead to constraints on the annihilation rate that are between a factor of 2 and a factor of 7 weaker than under non-informative priors. As a result, the thermal relic cross section can at best only be excluded (with 95% probability) for dark matter masses of $\lesssim 40$ GeV from dwarf spheroidal data, assuming annihilation into $b\bar{b}$.
