论文标题
使用经典的头虫的麦芽素云的3D地图
3D maps of the Magellanic Clouds using Classical Cepheids
论文作者
论文摘要
可变恒星已被用作确定天文距离的探针。这些距离可用于绘制附近星系的三维（3D）结构。利用移动到中红外对头孢菌的幅度和光曲线的影响，我们现在可以以3D的速度将最近的星系绘制为以前从未实现的忠诚度。将来自Ogle-IV目录的数据与来自Spitzer空间望远镜的中红外光度法结合在一起，使用了大约5000个基本模式头孢菌素来追踪麦哲伦云的3D结构。已经开发了一条自动光度计管道，以获得麦芽岩系统中的头孢虫的精确平均幅度和光曲线，进而为单个头孢虫提供准确至5％的单个头囊产生距离测量值。所得的详细地图用于探测麦哲伦云的几何和化学结构，以及它们的相互作用和动态历史。讨论了该项目的初始结果，并将未来的RR Lyrae恒星纳入来追踪系统的旧恒星种群。
Variable stars have been used for over one hundred years as probes for determining astronomical distances; these distances can be used to map the three-dimensional (3D) structure of nearby galaxies. Exploiting the effect that moving to the mid-infrared has on Cepheid magnitudes and light curves, we can now map our nearest galaxies in 3D at fidelities never before achievable. Combining data from the OGLE-IV catalogue with mid-infrared photometry from the Spitzer Space Telescope, around 5000 fundamental mode Cepheids are being used to trace the 3D structure of the Magellanic Clouds. An automated photometry pipeline has been developed to obtain precise mean magnitudes and light curves for Cepheids in the Magellanic System, which in turn produces distance measurements for individual Cepheids accurate to 5%. The resulting detailed maps are being used to probe the geometric and chemical structure of the Magellanic Clouds, as well as their interaction and dynamical histories. Initial results from this project are discussed and the future inclusion of RR Lyrae stars to trace the old stellar population of the system is described.
