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Charting the Structure of the Milky Way Stellar Halo and Disk

绘制银河系恒星晕和星盘的结构图

基本信息

批准号：
1615688
负责人：
Heidi Newberg
金额：
$ 35万
依托单位：
Rensselaer Polytechnic Institute
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-09-15 至 2019-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1615688&HistoricalAwards=false
关键词：
Charting Structure Milky Way Stellar

项目摘要

The investigator seeks to understand our Milky Way galaxy. The Milky Way has dozens of smaller dwarf galaxies in orbit around it. These dwarf galaxies are being ripped apart by our galaxy's gravity into long streams of stars. Some of these streams encircle the entire galaxy. The investigator recently discovered that the disk of the Milky Way, which includes the spiral structure, has previously unknown 'ripples'. These ripples are believed to form when smaller dwarf galaxies fall into the Milky Way, just as a pebble dropped into a pond produces ripples on the surface of the water. By mapping the density of stars throughout the Milky Way, this project model of the interaction between the Milky Way galaxy and the dwarf galaxies orbiting it. These models will help us understand where dark matter is located. The models also teach us how the spiral arms of galaxies are made and sustained. This project will train undergraduate students in science and computing. The investigator will engage the public in the scientific process through sustained public outreach initiatives. Public outreach will include science web pages, Facebook, Twitter, Instagram, YouTube videos, Reddit Ask Me Anything (AMA) sessions, opportunities to observe the sky through small telescopes, and hands-on outreach activities that will reach thousands of children, teens, adults, and seniors. A relationship will be maintained between the investigators and the ~20,000 people, at any given time, who volunteer their personal computers to create the MilkyWay@home supercomputer.The investigator will map the three dimensional stellar density in the disk and halo of our galaxy, using Sloan Digital Sky Survey main sequence and turnoff stars in the galaxy's halo. The investigator will use the technique of statistical photometric parallax to make the density maps. This technique recovers the underlying density distribution without measuring the distance to each individual star, because only the intrinsic brightness distribution is required.The outer disk and the stellar halo will be mapped with turnoff stars. Main sequence stars, which are intrinsically dimmer, will be used to trace the density of closer stars in the Milky Way disk. The investigator will map the dominant substructures, including the vertical oscillations of the stellar mid-plane.

研究人员试图了解我们的银河系。银河系周围有几十个较小的矮星系，这些矮星系被我们银河系的引力撕裂成长长的恒星流。其中一些流环绕着整个星系。研究人员最近发现，包括螺旋结构在内的银河系圆盘具有以前未知的“涟漪”。这些涟漪被认为是当较小的矮星系落入银河系时形成的，就像一颗石子落入池塘会在水面上产生涟漪一样。通过绘制整个银河系的恒星密度，这个项目建立了银河系和围绕它运行的矮星系之间相互作用的模型。这些模型将帮助我们了解暗物质的位置。这些模型还告诉我们星系的旋臂是如何形成和维持的。该项目将培养科学和计算方面的本科生。调查员将通过持续的公众宣传活动，使公众参与科学进程。公众宣传将包括科学网页，Facebook，Twitter，Instagram，YouTube视频，Reddit Ask Me Anything（AMA）会议，通过小型望远镜观察天空的机会，以及将接触数千名儿童，青少年，成人和老年人的动手推广活动。研究人员将与大约20，000人保持联系，在任何给定的时间，谁自愿他们的个人电脑创建MilkyWay@home超级计算机。研究人员将绘制三维恒星密度在磁盘和晕我们的星系，使用斯隆数字天空调查的主要序列和关闭恒星在星系的晕。研究者将使用统计光度视差技术来制作密度图。这种技术不需要测量到每一颗星星的距离，就可以恢复其密度分布，因为只需要得到其固有的亮度分布。主序星，本质上是暗淡的，将被用来跟踪银河系盘中较近的恒星的密度。研究人员将绘制主要的子结构，包括恒星中平面的垂直振荡。