SHARP – VII. New constraints on the dark matter free-streaming properties and substructure abundance from gravitationally lensed quasars
SHARP – VII. New constraints on the dark matter free-streaming properties and substructure abundance from gravitationally lensed quasars
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DOI：
10.1093/mnras/stz3177
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发表时间：
2019-05
影响因子：
4.8
通讯作者：
J. Hsueh;Wolfgang Enzi;S. Vegetti;M. Auger;C. Fassnacht;G. Despali;L. Koopmans;J. McKean
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作者：
J. Hsueh;Wolfgang Enzi;S. Vegetti;M. Auger;C. Fassnacht;G. Despali;L. Koopmans;J. McKean
本文分析了七个强引力透镜类星体，并讨论了它们对暗物质性质的限制。我们的研究结果是通过使用平滑的宏观模型和106-109兆质量范围内的低质量晕人口相结合的透镜图像的位置和通量比建模。我们的透镜模型明确包括高阶复杂性的形式，恒星盘和发光的卫星，以及低质量的晕位于沿着观测视线的第一次。假设一个冷暗物质（CDM）宇宙学，我们推断子结构中的平均总质量分数为f = 0.012^{+0.007}-0.004}$（68%置信限），这与CDM流体动力学模拟的预测一致，误差在1σ以内.这一结果比以前不包括视线晕的研究更接近预测。在热遗迹暗物质模型的假设下，我们推导出粒子遗迹质量的下限为mth > 5.58 keV（95%置信限），这与最近对Ly α森林的分析中mth > 5.3 keV的值一致。我们还确定了可能的系统误差的两个主要来源，并得出结论，更深入的调查，在复杂的结构的透镜星系以及背景源的大小应该是这个领域的优先事项。
We present an analysis of seven strongly gravitationally lensed quasars and the corresponding constraints on the properties of dark matter. Our results are derived by modelling the lensed image positions and flux-ratios using a combination of smooth macro-models and a population of low-mass haloes within the mass range of 106–109 M⊙. Our lens models explicitly include higher order complexity in the form of stellar discs and luminous satellites, as well as low-mass haloes located along the observed lines of sight for the first time. Assuming a cold dark matter (CDM) cosmology, we infer an average total mass fraction in substructure of $f_{\rm sub} = 0.012^{+0.007}_{-0.004}$ (68 per cent confidence limits), which is in agreement with the predictions from CDM hydrodynamical simulations to within 1σ. This result is closer to the predictions than those from previous studies that did not include line-of-sight haloes. Under the assumption of a thermal relic dark matter model, we derive a lower limit on the particle relic mass of mth > 5.58 keV (95 per cent confidence limits), which is consistent with a value of mth > 5.3 keV from the recent analysis of the Ly α forest. We also identify two main sources of possible systematic errors and conclude that deeper investigations in the complex structure of lens galaxies as well as the size of the background sources should be a priority for this field.