The stellar content of wide-angle soft X-ray sky surveys

广角软X射线巡天的恒星含量

• 批准号: 314771936
• 负责人: Professor Dr. Jürgen H.M.M. Schmitt
• 金额: --
• 依托单位: Hamburger Sternwarte
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/314771936?language=en
• 关键词: stellar; content; wide; angle; soft

Within the next two years the data currently collected by the Gaia satellite (launched in December 2013) will become available for astronomical usage at large. This data is likely to revolutionise astronomy at large and also stellar X-ray astronomy. The Gaia data release specifically implies that a complete stellar catalog containing precise photometry in three bands (two in broad band, one in a narrow band) will become available, and, furthermore, precise parallax and proper motion information will become available for essentially all of the brighter stars. As far as stellar X-ray astronomy is concerned, this implies that basically all stars that have been/will be detected in the framework of the ROSAT all-sky survey, the XMM-Newton slew survey and the future eROSITA all-sky survey (to be conducted between 2017-2021) will have precisely known parallaxes and hence distances, thus allowing the computation of X-ray luminosities accurate to approximately 10% or better. For the first time large samples containing hundreds and thousands of X-ray bright stars will become available allowing an assessment of the high-luminosity tail of the distribution functions that is relevant for any quantitative assessment of the X-ray source counts. Furthermore, systematic studies of young stars in the general field will become possible, where they have dispersed from the birth regions. In the framework of this funding application we ask for support to carry out an effort to extract the stellar content of the ROSAT all-sky survey and the XMM-Newton slew survey using existing high-precision stellar catalogs and the upcoming Gaia data in terms of photometry and parallaxes. With these inputs we expect to identify the stellar population in these X-ray surveys with high accuracy and reliability and will use the results to compute accurate X-ray luminosity functions, space densities of active stars and identify the post T Tauri population of young stars in the field.

在接下来的两年中，盖亚卫星目前收集的数据（于2013年12月推出）将用于整个天文使用。这些数据可能会彻底改变整个天文学，而且恒星X射线天文学。 Gaia数据发布特别意味着一个完整的恒星目录，其中包含三个频段（宽带中的两个，一个在狭窄的频段中的一个）中的精确光度法，并且此外，对于所有较亮星而言，精确的视差和适当的运动信息将用于基本上。就恒星X射线天文学而言，这意味着在Rosat All-Sky调查，XMM-Newton Slew调查以及未来的Erosita All-Sky调查（将在2017-2021之间进行）将在XMM-Newton Slew的调查和未来的Erosita All-Sky调查（在2017-2021之间进行）基本上都可以检测到的所有明星，从而可以准确地允许X-Ray or Comperity coctians x-ray or comperity coctians coctians tecortiation。首次将有成千上万的X射线明亮恒星的大型样品可用，以评估与X射线源计数的任何定量评估相关的分布函数的高光度尾部。此外，对一般领域的年轻恒星的系统研究将成为可能，在那里他们从出生地区分散。在此资助申请的框架内，我们要求支持以使用现有的高精度恒星目录以及即将到来的Gaia数据来提取Rosat All-Sky调查和XMM-Newton Slew Sune的杰出含量，并以光度和视差为单位。有了这些输入，我们希望以高准确性和可靠性确定这些X射线调查中的恒星种群，并将使用结果来计算准确的X射线光度功能，活性恒星的空间密度，并确定该领域年轻恒星的T托里人群。