Constraints on the identity of the dark matter from strong gravitational lenses

Constraints on the identity of the dark matter from strong gravitational lenses
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强引力透镜对暗物质身份的限制

DOI:
10.1093/mnras/stw939
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发表时间:
2015-12
影响因子:
4.8
通讯作者:
Hellwing, Wojciech A.
Hellwing, Wojciech A.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cole, Shaun;Gao, Liang;Bose, Sownak;Hellwing, Wojciech A.

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冷暗物质(CDM)宇宙学模型明确地预测,当大量的晕被吸积成一个更大的晕时,它们应该以亚晕的形式存在。如果这些子结构被证明不存在,CDM模型将被排除在外。相比之下,如果暗物质由热粒子(WDM)组成,那么在依赖于粒子质量的阈值质量之下,存在的子结构就会少得多。找到低于一定质量的亚晕,就可以排除低于某个值的热粒子。强引力透镜提供了一种通过爱因斯坦环和巨弧结构的扭曲来测量亚晕质量函数的干净方法。利用高分辨率n体模拟构建的模拟透镜观测,我们表明,对大约100个检测极限为10^7h−1M⊙的强透镜系统的测量将清楚地区分CDM和WDM,在这种情况下,CDM由7个keV不育中微子组成,例如那些可能负责最近在星系和星系团中检测到的3.5 keV x射线发射线。
The cold dark matter (CDM) cosmological model unambiguously predicts that a large number of haloes should survive as subhaloes when they are accreted into a larger halo. The CDM model would be ruled out if such substructures were shown not to exist. By contrast, if the dark matter consists of warm particles (WDM), then below a threshold mass that depends on the particle mass far fewer substructures would be present. Finding subhaloes below a certain mass would then rule out warm particle masses below some value. Strong gravitational lensing provides a clean method to measure the subhalo mass function through distortions in the structure of Einstein rings and giant arcs.Using mock lensing observations constructed from high-resolution N-body simulations, we show that measurements of approximately 100 strong lens systems with a detection limit of 10^7h−1M⊙ would clearly distinguish CDM from WDM in the case where this consists of 7 keV sterile neutrinos such as those that might be responsible for the 3.5 keV X-ray emission line recently detected in galaxies and clusters.
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