标题： 星 occult 能为你做什么？ 多 occult 星系（STARSMOG）的星光衰减和消光调查 显示英文标题

标题： What can the Occult do for you? STarlight Attenuation & Reddening Survey of Multiple Occulting Galaxies (STARSMOG)

摘要： 星际尘埃仍然是天文学中的主要不确定性因素，限制了诸如宇宙距离估算和星系内光重新处理模型的精确性。 当一个前景星系偶然与一个更遥远的星系重叠时，后者会照亮靠近前景星系的尘埃结构。 这种重叠或遮挡的星系对可以被用来非常准确地测量最近的星系中的尘埃分布。 **STARSMOG** 计划利用哈勃太空望远镜（HST）观测遮挡星系对，以精细（$<$100 pc）的细节准确绘制前景星系中的尘埃分布图。 此外，对这些星系对的积分场单元观测将绘制这些遮挡星系的有效消光曲线，解开小尺度几何形状和颗粒成分在星系中光传播路径上的作用。 重叠星系技术有望清晰了解星系中的尘埃：尘埃的几何形状、不同星系类型中因尘埃导致的亮度减弱的概率函数、其对波长的依赖性，以及所有这些性质随宇宙时间的变化——特别是通过遥远的高红移星系对。 显示英文摘要

摘要： Interstellar dust is still the dominant uncertainty in Astronomy, limiting precision in e.g., cosmological distance estimates and models of how light is re-processed within a galaxy. When a foreground galaxy serendipitously overlaps a more distant one, the latter backlights the dusty structures in the nearer foreground galaxy. Such an overlapping or occulting galaxy pair can be used to measure the distribution of dust in the closest galaxy with great accuracy. The STARSMOG program uses HST observation of occulting galaxy pairs to accurately map the distribution of dust in foreground galaxies in fine ($<$100 pc) detail. Furthermore, Integral Field Unit observations of such pairs will map the effective extinction curve in these occulting galaxies, disentangling the role of fine-scale geometry and grain composition on the path of light through a galaxy. The overlapping galaxy technique promises to deliver a clear understanding of the dust in galaxies: the dust geometry, a probability function of the amount of dimming as a function of galaxy type, its dependence on wavelength, and evolution of all these properties with cosmic time using distant, high-redshift pairs.