Dark Matter Constraints from a Unified Analysis of Strong Gravitational Lenses and Milky Way Satellite Galaxies
Dark Matter Constraints from a Unified Analysis of Strong Gravitational Lenses and Milky Way Satellite Galaxies
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DOI：
10.3847/1538-4357/abf9a3
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
E. Nadler;S. Birrer;D. Gilman;R. Wechsler;X. Du;A. Benson;A. Nierenberg;T. Treu
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文献类型：
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作者：
E. Nadler;S. Birrer;D. Gilman;R. Wechsler;X. Du;A. Benson;A. Nierenberg;T. Treu
小尺度宇宙学结构探测器的联合分析是相对未开发的，并承诺使用异质数据推进微物理暗物质特性的测量。在这里，我们提出了一个多维分析的暗物质子结构使用强引力透镜和银河系（MW）卫星星系人口，占模型预测的退化和使用协方差的约束力，这些个人的探测器的第一次。我们同时推断的投影subhalo数密度和半模质量描述的热遗迹温暖的暗物质（WDM），M hm的subhalo质量函数的抑制，使用半解析模型Galacticus连接从MW卫星观测推断的subhalo人口强透镜主机晕质量和红移制度。在该参数空间中组合MW卫星和强透镜后验在95%置信度下产生M hm（9.7 keV），并且在20：1的边际似然比下不利于M hm = 107.4 M hm（m WDM = 7.4 keV），将通过两种方法独立设置的m WDM的限制提高了30%。这些结果被边缘化的视线贡献的强透镜信号，MW主机晕的质量，和由于重子的subhalo中断的效率和强大的MW和强透镜制度之间的中断效率的差异在10%的水平。这项工作为下一代小尺度结构测量的统一分析铺平了道路，涵盖了广泛的尺度和红移。
Joint analyses of small-scale cosmological structure probes are relatively unexplored and promise to advance measurements of microphysical dark matter properties using heterogeneous data. Here, we present a multidimensional analysis of dark matter substructure using strong gravitational lenses and the Milky Way (MW) satellite galaxy population, accounting for degeneracies in model predictions and using covariances in the constraining power of these individual probes for the first time. We simultaneously infer the projected subhalo number density and the half-mode mass describing the suppression of the subhalo mass function in thermal relic warm dark matter (WDM), M hm, using the semianalytic model Galacticus to connect the subhalo population inferred from MW satellite observations to the strong lensing host halo mass and redshift regime. Combining MW satellite and strong lensing posteriors in this parameter space yields M hm 9.7 keV) at 95% confidence and disfavors M hm = 107.4 M ⊙ (m WDM = 7.4 keV) with a 20:1 marginal likelihood ratio, improving limits on m WDM set by the two methods independently by ∼30%. These results are marginalized over the line-of-sight contribution to the strong lensing signal, the mass of the MW host halo, and the efficiency of subhalo disruption due to baryons and are robust to differences in the disruption efficiency between the MW and strong lensing regimes at the ∼10% level. This work paves the way for unified analyses of next-generation small-scale structure measurements covering a wide range of scales and redshifts.