论文标题
测试原始黑洞暗物质，并观察到重力镜头B1422+231
Testing Primordial Black Hole Dark Matter with ALMA Observations of the Gravitational Lens B1422+231
论文作者
论文摘要
我们检查了四倍体的强力透镜中的通量密度比异常，B1422+231，并考虑$ 10-10^3M _ {\ odot} $ Primordial Black Holes（PBHS）的贡献是潜在的暗物质。我们使用Atacama大毫米阵列（ALMA）描述了毫米波带中B1422+231的第一个磁通密度比测量。这填补了我们对这个关键镜头系统的重要多波长差距。 233 GHz的类星体的通量密度以同步加速器发射为主，源尺寸估计为66.9 PC。在233 GHz处观察到的通量密度比与无线电，中红外和光学带中的磁通密度比相似，这无法通过透镜星系的简单平滑质量模型来解释。我们检查了使用射线示踪模拟引起的PBH微透镜引起的通量密度比异常的概率。模拟考虑了带有功率法质量功能的$ 10-10^3M _ {\ odot} $ PBHS的10％和50％的案例。我们的分析表明，B1422+231的异常通量密度比可以通过透镜模型来解释，其暗物质是PBHS。这项研究证明了使用ALMA观察到倍数成像的强力透镜，对PBH暗物质产生了新的约束。
We examine the flux density ratio anomaly in the quadruply-imaged strong gravitational lens, B1422+231, and consider the contribution of $10-10^3M_{\odot}$ primordial black holes (PBHs) as a potential dark matter constituent. We describe the first flux density ratio measurement of B1422+231 in the millimeter-wave band using the Atacama Large Millimeter Array (ALMA). This fills an important multi-wavelength gap in our knowledge of this key lensed system. The flux density of the quasar at 233 GHz is dominated by synchrotron emission and the source size is estimated to be 66.9 pc. The observed flux density ratios at 233 GHz are similar to those measured in radio, mid-infrared and optical bands, which cannot be explained by a simple smooth mass model of the lens galaxy. We examine the probability of the flux density ratio anomaly arising from PBH microlensing using ray tracing simulations. The simulations consider the cases where 10% and 50% of dark matter are $10-10^3M_{\odot}$ PBHs with a power law mass function. Our analysis shows that the anomalous flux density ratio for B1422+231 can be explained by a lens model with a significant fraction of dark matter being PBHs. This study demonstrates the potential for new constraints on PBH dark matter using ALMA observations of multiply imaged strong gravitational lenses.
