Scanning-releasing the full-sky-century database to DASCH for TDA

扫描-发布全天世纪数据库到DASCH进行TDA

• 批准号: 1313370
• 负责人: Jonathan Grindlay
• 金额: $ 156.84万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-15 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1313370&HistoricalAwards=false
• 关键词: Scanning; releasing; full; sky; century

This is the last stage of a NSF supported effort. The Digital Analysis of a Sky Century @ Harvard (DASCH) project is now fully ready with its hardware, software and personnel resource planning and full production scanning, processing and data distribution and archiving can begin. This final grant will bring the world's only full-century Time Domain Astrophysics (TDA) database and analysis tools on line for the full community to utilize as a key survey that complements current surveys (PTF, CRT and PS1) and provides long-term context for LSST. The high speed precision DASCH scanner (two 8 x 10in imaging plates digitized into 11μm pixels in 90 sec) and initial astrometry and photometry have now i) improved astrometry that allows multiple exposure plate solutions as well as initial astrometry essentially independent of what the plate jacket might have indicated, ii) improved photometry. We build the Pipeline and Database software and hardware to enable the original goal to scan and fully process ~400 plates/day, which would enable the full collection of ~450,000 direct imaging plates to be scanned and fully reduced, with rapid access to images (thumbnails), lightcurves , and data products on spinning disk. The present effort will finish the production scanning, overnight processing, and full data releases (DRs, in 10 installments) of the ~375,000 plates remaining. Although a single field (6o centered on M44, our first "development field") is now in the public domain, the limited coverage presents the novel TDA surveys that DASCH can do for discovery and study of rare classes of variables which require larger survey coverage. DASCH incorporates students at every stage and a vigorous program of Public Outreach. This research will open the astronomical window of time variability on long timescales (months-100y) from currently existing, but inaccessible and barely-mined data. Digitization is the key and can now be done with our new ultra-high speed scanner and high speed processing and database. Accessing the past data complements present (e.g. PanSTARRS) and future temporal surveys (LSST). Opening this new temporal window has already revealed new phenomena; it will surely excite new students and the public at large.This project will awaken the public awareness that the universe is not static. Evolution and change are the rule, not the exception. The impact on science education can be large: by showing on the project website segments of the "cosmic movie" of giant flares from quasars or stars, or the heart beat pulsations of Cepheid variables, students will better understand the excitement of current astronomy. Physical understanding of the dynamic universe is even more enticing than the immutable sky. The public website to be fully developed by this investigation will be fully accessible to the public and astronomical community. DASCH will have significant impact on the general drive to Temporal Surveys for a number of projects now in development. It makes available the truly unique dataset that only a century of sky coverage can provide.

这是NSF支持工作的最后阶段。天空世纪的数字分析@哈佛（DASCH）项目现已完全准备好其硬件，软件和人力资源规划，并可以开始全面生产扫描，处理和数据分发和存档。这一最终拨款将为整个社区带来世界上唯一的全世纪时域天体物理学（TDA）数据库和分析工具，作为补充当前调查（PTF，CRT和PS1）的关键调查，并为LSST提供长期背景。高速精密DASCH扫描仪（两个8 x 10英寸成像板数字化为11& #956; 90秒内的m像素）和初始天体测量和光度测定现在具有i）改进的天体测量，其允许多次曝光板溶液以及基本上独立于板套可能指示的初始天体测量，ii）改进的光度测定。 我们构建了流水线和数据库软件和硬件，以实现每天扫描和完全处理约400个板的原始目标，这将使约450，000个直接成像板的完整收集能够被扫描和完全减少，并快速访问旋转磁盘上的图像（缩略图），光曲线和数据产品。 目前的工作将完成剩余约375，000个平板的生产扫描、隔夜处理和完整数据发布（DR，分10期）。虽然一个单一的领域（6 o集中在M44，我们的第一个“发展领域”）现在是在公共领域，有限的覆盖面提出了新的TDA调查，DASCH可以做的发现和研究的罕见类别的变量，需要更大的调查覆盖面。DASCH融合了每个阶段的学生和公共推广的有力计划。这项研究将从现有的，但无法访问和几乎没有挖掘的数据中打开长时间尺度（月-100年）的时间变化的天文窗口。数字化是关键，现在可以通过我们新的超高速扫描仪和高速处理和数据库来完成。过去的数据补充了现在（如PanSTARRS）和未来的时间调查（LSST）。打开这个新的时间窗口已经揭示了新的现象;它肯定会让新学生和广大公众感到兴奋。这个项目将唤醒公众意识到宇宙不是静态的。进化和变化是规律，而不是例外。对科学教育的影响可能很大：通过在项目网站上展示类星体或恒星的巨大耀斑或造父变星的心跳脉动的“宇宙电影”片段，学生将更好地理解当前天文学的兴奋之处。对动态宇宙的物理理解甚至比不变的天空更诱人。这次调查将全面开发的公共网站将完全供公众和天文学界使用。DASCH将对目前正在开发的一些项目的时间调查的一般驱动力产生重大影响。它提供了只有世纪的天空覆盖才能提供的真正独特的数据集。