论文标题
簇强镜头的暗物质自我交叉截面上的严格上限
A Stringent Upper Limit on Dark Matter Self-Interaction Cross Section from Cluster Strong Lensing
论文作者
论文摘要
我们分析了8个星系簇中的强烈镜头图像，以测量径向区域中10 kpc和150 kpc之间的暗物质密度曲线，并使用它来限制暗物质（DM）颗粒的自我相互作用横截面。我们使用Qlens代码推断了中央DM光环，明亮的中央星系，关键成员星系和DM Subhalos的质量曲线。推断的DM光环表面密度适合自相互作用的暗物质（SIDM）模型，这使我们能够约束质量$σ$/m的自相互作用横截面。当我们将完整的方法应用于Illustris-Tng模拟中两个簇中生成的模拟数据时，我们发现结果与预期的无暗物质自我相互作用一致。 For the eight observed clusters with average relative velocities of $1458_{-81}^{+80}$ km/s, we infer $σ$/m = $0.082_{-0.021}^{+0.027}$ cm$^2$/g and $σ$/m < 0.13 cm$^2$/g at the 95% confidence level.
We analyze strongly lensed images in 8 galaxy clusters to measure their dark matter density profiles in the radial region between 10 kpc and 150 kpc, and use this to constrain the self-interaction cross section of dark matter (DM) particles. We infer the mass profiles of the central DM halos, bright central galaxies, key member galaxies, and DM subhalos for the member galaxies for all 8 clusters using the Qlens code. The inferred DM halo surface densities are fit to a self-interacting dark matter (SIDM) model, which allows us to constrain the self-interaction cross section over mass $σ$/m. When our full method is applied to mock data generated from two clusters in the Illustris-TNG simulation, we find results consistent with no dark matter self-interactions as expected. For the eight observed clusters with average relative velocities of $1458_{-81}^{+80}$ km/s, we infer $σ$/m = $0.082_{-0.021}^{+0.027}$ cm$^2$/g and $σ$/m < 0.13 cm$^2$/g at the 95% confidence level.
