论文标题
星系暗孔中原始黑洞的签名
The signature of primordial black holes in the dark matter halos of galaxies
论文作者
论文摘要
本文的目的是调查重力镜头类星体系统镜头星系中的恒星始终可以说明单个类星体图像的微透明的说法。选择了一小部分重力镜头的类星体系统,即类星体图像似乎位于镜头星系的恒星分布的边缘。与大多数类星体系统一样,观察到所有单独的类星体图像被微覆盖。从HST框架测量了标准图像位置的镜头星系的表面亮度,并转换为恒星表面质量密度。从类星体系统的镜头模型中获得了图像位置的平滑分布暗物质的表面密度,并应用于恒星表面质量密度,以使光学深度为微透明。然后使用它来评估镜头星系中的恒星可能导致观察到的微透明的概率。结果是通过对类星体图像周围的恒星场的微透镜模拟来支持的,并结合了镜头模型的收敛和剪切值。两者合计,所有观察到的微透明的概率都是由于恒星〜0.0003。由表面亮度测量,质量与光比和暗物质光环的贡献产生的错误不会显着影响这一结果。有人认为,微玻璃的最合理的候选者是原始的黑洞,在镜头星系的暗物质光环中,或者更普遍地沿着视线分布到类星体。
The aim of this paper is to investigate the claim that stars in the lensing galaxy of a gravitationally lensed quasar system can always account for the observed microlensing of the individual quasar images. A small sample of gravitationally lensed quasar systems was chosen where the quasar images appear to lie on the fringe of the stellar distribution of the lensing galaxy. As with most quasar systems, all the individual quasar images were observed to be microlensed. The surface brightness of the lensing galaxy at the positions of the quasar images was measured from HST frames, and converted to stellar surface mass density. The surface density of smoothly distributed dark matter at the image positions was obtained from lensing models of the quasar systems and applied to the stellar surface mass density to give the optical depth to microlensing. This was then used to assess the probability that the stars in the lensing galaxy could be responsible for the observed microlensing. The results were supported by microlensing simulations of the star fields around the quasar images combined with values of convergence and shear from the lensing models. Taken together, the probability that all the observed microlensing is due to stars was found to be ~0.0003. Errors resulting from surface brightness measurement, mass-to-light ratio and the contribution of the dark matter halo do not significantly affect this result. It is argued that the most plausible candidates for the microlenses are primordial black holes, either in the dark matter halos of the lensing galaxies, or more generally distributed along the lines of sight to the quasars.