论文标题
SDSS J1004+4112：由原始黑洞主导的星系群集的案例
SDSS J1004+4112: the case for a galaxy cluster dominated by primordial black holes
论文作者
论文摘要
本文的目的是为在群集镜头类星体系统SDSS J1004+4112中观察到的大幅度微透明事件提供合理的解释。微晶的类星体图像似乎很清楚集群的恒星种群，从而提高了簇暗物质由造成观察到的微透镜的紧凑型物体组成的可能性。在本文的第一部分中，我们建立了差异光曲线的确切结构，归因于文献中光度监测程序的微透镜。然后，我们从表面亮度的测量中表明，恒星在簇中微覆盖的可能性忽略不计。最后，我们放松了假设簇暗物质是平滑分布的颗粒的形式，而是由紧凑的身体组成。然后，我们使用所得放大模式的计算机模拟来估计微透镜的概率。我们的结果表明，对于源尺寸和晶状体质量的一系列值，观察到的较大的微透镜幅度与模拟的统计数据一致。我们得出的结论是，提供平滑分布的暗物质的假设是放松的，可以通过允许簇暗物质的形式来解释观察到的大幅度微透明。我们进一步得出结论，这些物体最合理的身份是原始的黑洞。
The aim of this paper is to provide a plausible explanation for the large amplitude microlensing events observed in the cluster lensed quasar system SDSS J1004+4112. The microlensed quasar images appear to lie well clear of the stellar population of the cluster, raising the possibility that the cluster dark matter is composed of compact bodies which are responsible for the observed microlensing. In the first part of the paper we establish the exact structure of the difference light curves attributed to microlensing from photometric monitoring programmes in the literature. We then show from measures of surface brightness that the probability of microlensing by stars in the cluster is negligibly small. Finally we relax our assumption that the cluster dark matter is in the form of smoothly distributed particles, but instead is made up of compact bodies. We then use computer simulations of the resulting magnification pattern to estimate the probability of microlensing. Our results show that for a range of values for source size and lens mass the observed large microlensing amplitude is consistent with the statistics from the simulations. We conclude that providing the assumption of smoothly distributed dark matter is relaxed, the observed large amplitude microlensing can be accounted for by allowing the cluster dark matter to be in the form of solar mass compact bodies. We further conclude that the most plausible identity for these bodies is primordial black holes.
