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arXiv 1809.07079astro-ph.COastro-ph.GA
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透镜引力波和暗物质子结构的时滞异常

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

Kai Liao, Xuheng Ding, Marek Biesiada, Xi-Long Fan, Zong-Hong Zhu

摘要:

冷暗物质的分级大尺度结构的形成的情况下预测的存在丰富的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。引力透镜是一种强有力的工具,可以直接探测质量分布,而不管它是可见的还是暗的。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,透镜引力波检测的第三代地面探测器与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。结合高质量的图像的透镜的主机星系的电磁对应测量,透镜GW信号可以使系统误差所造成的暗物质子结构检测在百分之几的水平,这取决于它们的质量函数,内部分布的subhalos和透镜系统的配置。

英文摘要:

The cold dark matter scenario of hierarchical large-scale structure formation predicts 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 GW signals could make the systematic errors caused by dark matter substructures detectable at several percent levels, depending on their mass functions, internal distribution of subhalos and lensing system configuration.

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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