arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.06611astro-ph.CO
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团簇强透镜暗物质自相互作用截面的严格上限

A Stringent Upper Limit on Dark Matter Self-Interaction Cross Section from Cluster Strong Lensing

Kevin E. Andrade, Jackson Fuson, Sophia Gad-Nasr, Demao Kong, Quinn Minor, M. Grant Roberts, Manoj Kaplinghat

摘要:

我们分析了8个星系团的强透镜图像,测量它们在10 kpc和150 kpc之间的径向区域的暗物质密度分布,并使用它来约束暗物质(DM)粒子的自相互作用截面。我们推断的质量配置文件的中央DM晕,明亮的中央星系,关键成员星系,DM subhalos的成员星系的所有8个集群使用Qlens代码。推断的DM晕表面密度适合自相互作用暗物质(SIDM)模型,这使我们能够约束质量$σ$ /m的自相互作用截面。当我们的完整的方法被应用到模拟数据产生的两个集群在插图TNG模拟,我们发现结果符合没有暗物质自相互作用的预期。对于8个观测到的平均相对速度为$1458_{-81}^{+80}$ km/s的星系团,在95%的置信水平下,我们推断$σ$ /m = $0.082_{-0.021}^{+0.027}$ cm $^2$ /g且$σ$ /m < 0.13 cm $^2$ /g。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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