论文标题
通过紧凑物体对乳乳外微透析的准确建模
Accurate modelling of extragalactic microlensing by compact objects
论文作者
论文摘要
对银河外源的微透析，特别是显着放大的概率，是对银河系外的光环之外的丰富物体的潜在强大探针。准确的实验约束需要同样准确的理论模型，以实现由这种人群产生的放大统计数据。在本文中，我们认为最简单的（最强的镜头）模型不符合这一苛刻的要求。因此，我们提出了一种精心制作的实用建模方案，以实现乳乳外微透镜。我们从第一原理中得出了一个始终允许的放大概率的表达式：（i）微丝之间的耦合； （ii）宇宙大规模结构的现实扰动； （iii）扩展源更正。一个重要的结论是，实际上是通过其他镜头和大规模结构应用于主要的微丝片上的外部剪切，实际上可以忽略不计。然而，关于文献的现有模型，我们方法的预测仍然可能会因少数因素而差异。可能需要更新对紧凑对象的限制，以解决此类差异。
Microlensing of extragalactic sources, in particular the probability of significant amplifications, is a potentially powerful probe of the abundance of compact objects outside the halo of the Milky Way. Accurate experimental constraints require an equally accurate theoretical model for the amplification statistics produced by such a population. In this article, we argue that the simplest (strongest-lens) model does not meet this demanding requirement. We thus propose an elaborate practical modelling scheme for extragalactic microlensing. We derive from first principles an expression for the amplification probability that consistently allows for: (i) the coupling between microlenses; (ii) realistic perturbations from the cosmic large-scale structure; (iii) extended-source corrections. An important conclusion is that the external shear applied on the dominant microlens, both by the other lenses and by the large-scale structure, is practically negligible. Yet, the predictions of our approach can still differ by a factor of a few with respect to existing models of the literature. Updated constraints on the abundance of compact objects accounting for such discrepancies may be required.
