Mapping Dust in 3-D with Pan-STARRS

使用 Pan-STARRS 绘制 3D 灰尘图

• 批准号: 1312891
• 负责人: Douglas Finkbeiner
• 金额: $ 31.69万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1312891&HistoricalAwards=false
• 关键词: Mapping; Dust; Pan; STARRS

The project will map the spatial distribution of dust within the Milky Way. Their project traces Galactic structure and star formation, and is a tool for correcting for interstellar extinction. Previous work on dust structure has focused primarily on the projected density of dust, yielding two-dimensional maps of the dust column density across the sky. Their new approach is to produce a dust map is to measure stellar extinction directly. By combining distance and extinction estimates for a large number of stars across the sky, it is possible to produce a three-dimensional map of interstellar extinction. PanSTARRS-1 has been surveying 3ð steradians of the sky, producing a point-source catalog of more than 500,000,000 stars in five passbands They propose to produce a high-resolution three-dimensional dust map across three-quarters of the sky using PanSTARRS-1 photometry, and to make it available to the public.Their 3-D map will allow estimation of distances to individual dust clouds and filaments, and better utilize information from CO and HI surveys, which suffer from velocity-distance degeneracy. Such a map also improves the understanding of the 3D distribution of stars, allowing for less biased searches for dwarf galaxies and tidal streams. When the researchers combine hundreds or thousands of stars along the same line of sight (in one spatial pixel) they provide a powerful constraint on the dust distribution along the line of sight.A graduate student will carry out part of this research and will be trained in developing and applying theory, observation, and statistical analysis tools to problems in Galaxy formation and evolution. They will release the data for use via the World Wide Telescope (WWT). The WWT is a leading educational tool bringing the awe and beauty of astronomy to the public. It allows the user to zoom and pan around the sky, seamlessly merging full-sky maps at various wavelengths with detailed observations of particular objects. WWT has a 3D mode, in which the user can move through the 3D structure of the Solar System, Galaxy, and large-scale structure maps provided by redshift surveys. The PI has previously contributed the SFD dust map and H-alpha maps to the WWT project, and expects to contribute a 3D dust map as soon as possible.

该项目将绘制银河系内尘埃的空间分布图。他们的项目追踪银河系的结构和星星的形成，是校正星际灭绝的工具。以前关于尘埃结构的工作主要集中在尘埃的投影密度上，产生了天空中尘埃柱密度的二维地图。他们的新方法是制作一张尘埃图，直接测量恒星的灭绝。通过结合对天空中大量恒星的距离和灭绝估计，有可能产生星际灭绝的三维地图。PanSTARRS-1一直在测量30亿球面度的天空，在五个通带中产生超过5亿颗恒星的点源目录。他们建议使用PanSTARRS-1测光法产生一个高分辨率的三维尘埃图，覆盖四分之三的天空，并向公众提供。他们的三维地图将允许估计单个尘埃云和细丝的距离，更好地利用CO和HI调查的信息，这些调查受到速度-距离简并的影响。这样的地图也提高了对恒星3D分布的理解，允许对矮星系和潮汐流进行更少的偏差搜索。 当研究人员将联合收割机沿沿着同一视线（在一个空间像素中）的数百或数千颗恒星组合在一起时，它们就对沿沿着的尘埃分布提供了强有力的约束。一名研究生将进行部分研究，并将接受开发和应用理论、观测和统计分析工具来解决星系形成和演化问题的培训。他们将通过万维望远镜（WWT）发布数据。 WWT是一个领先的教育工具，将天文学的敬畏和美丽带给公众。它允许用户在天空中缩放和平移，无缝地合并各种波长的全天空地图与特定物体的详细观察。WWT有一个3D模式，用户可以在太阳系、银河系的3D结构和红移测量提供的大尺度结构图中移动。PI之前已经为WWT项目提供了SFD灰尘图和H-alpha图，并希望尽快提供3D灰尘图。