Anomalies in Time Delays of Lensed Gravitational Waves and Dark Matter Substructures

Anomalies in Time Delays of Lensed Gravitational Waves and Dark Matter Substructures
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透镜引力波和暗物质子结构的时间延迟异常

DOI:
10.3847/1538-4357/aae30f
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发表时间:
2018-09
影响因子:
4.9
通讯作者:
Zhu Zong-Hong
Zhu Zong-Hong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liao Kai;Ding Xuheng;Biesiada Marek;Fan Xi-Long;Zhu Zong-Hong

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冷暗物质的分级大尺度结构的形成方案预测存在丰富的subhalos周围的大型星系。然而,观测到的矮星系的数量与理论预测相差甚远,这表明大多数的暗晕可能是黑暗的或相当微弱的。引力透镜是一个强大的工具,可以直接探测质量分布,而不管它是可见的还是黑暗的。强透镜类星体系统中的时间延迟异常与探测星系中暗物质亚结构的通量比异常是互补的。在这里,我们建议,由第三代地面探测器探测到的引力透镜波具有相当准确的时间延迟测量,可能是一个更好的工具,这项研究比传统的技术。结合由电磁对应测量确定的透镜宿主星系的高质量图像,透镜引力波信号可以使暗物质子结构引起的系统误差在百分之几的水平上被检测到,这取决于它们的质量函数,子晕的内部分布和透镜系统配置。
Cold dark matter scenarios of hierarchical large-scale structure formation predict the existence of abundant subhalos around large galaxies. However, the number of observed dwarf galaxies is far from this theoretical prediction, suggesting that most of the subhalos could be dark or quite faint. Gravitational lensing is a powerful tool to probe the mass distribution directly irrespective of whether it is visible or dark. Time delay anomalies in strongly lensed quasar systems are complementary to flux-ratio anomalies in probing dark matter substructure in galaxies. Here we propose that lensed gravitational waves detected by the third-generation ground detectors with quite accurate time delay measurements could be a much better tool for this study than conventional techniques. Combined with good quality images of lensed host galaxies identified by the electromagnetic counterpart measurements, lensed gravitational wave signals could make the systematic errors caused by dark matter substructures detectable at levels of several percent, depending on their mass functions, internal distribution of subhalos, and lensing system configuration.
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