We investigate gravitational microlensing signals produced by a spatially extended object transiting in front of a finite-sized source star. The most interesting features arise for lens and source sizes comparable to the Einstein radius of the setup. Using this information, we obtain constraints from the Subaru- survey of M31 on the dark matter populations of subhalos and boson stars of asteroid to Earth masses. These lens profiles capture the qualitative behavior of a wide range of dark matter substructures. We find that dark matter fractions down to $5\times {10}^{-3}$ may be probed, and that deviations from constraints on point-like lenses (e.g. primordial black holes and s) become visible for lenses of radius 0.1~$R_{\odot }$ and larger, with the upper bound on lens masses weakening with increasing lens size.

中文翻译：

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Subaru-HSC通过不同的透镜：扩展的暗物质结构的微透镜

我们研究了由空间扩展的物体在有限尺寸的源恒星前传播而产生的重力微透镜信号。与镜头的爱因斯坦半径相当的镜头和光源尺寸会出现最有趣的功能。利用这些信息，我们从M31的Subaru-调查中获得了对亚晕和小行星玻色子恒星的暗物质种群到地球质量的约束。这些镜片轮廓记录了各种暗物质亚结构的定性行为。我们发现暗物质的比例下降到$5\times {10}^{-3}$ 可能会被探测到，并且对于半径为0.1〜的透镜，在点状透镜（例如原始黑洞和s）上的约束偏差变得明显。${\mathrm{[R}}_{\odot }$ 更大，镜头质量的上限会随着镜头尺寸的增加而减弱。