New Gravitational Lenses, Time Delays, and Microlensing with the Magellan Telescopes

麦哲伦望远镜的新型引力透镜、时间延迟和微透镜

• 批准号: 0206010
• 负责人: Paul Schechter
• 金额: $ 28.96万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206010&HistoricalAwards=false
• 关键词: New; Gravitational; Lenses; Time; Delays

AST-0206010Schechter, Paul L.In this project two distinct strategies will be used to search at optical wavelengths for gravitationally lensed quasars. First, conventional (but highly automated) pointed direct images will be obtained of 6500 known quasars with the Magellan I (Baade) telescope. Second, direct images in three filters will be obtained for 1000 square degrees with 0.24 arcsecond pixels and subarcsecond resolution with the MPIA 2.2-m telescope. A conservative estimate of the expected number of lenses is 32, exceeding the number of systems found separately in the past two decades by either optical or radio techniques. As 90% of quasars are radio quiet, these two searches will complement recent successful radio searches and furnish systems bright enough for extensive followup at optical wavelengths. Gravitationally lensed quasars select galaxies by mass, rather than light. Samples of lensing galaxies, typically at intermediate redshifts, complement intermediate redshift samples selected by apparent magnitude. They give mass functions rather than luminosity functions, an important component of galaxy evolution models. Lensed quasars also permit measurement of the Hubble constant, the cosmological parameter which sets the scale for the Universe. The Hubble constant is sufficiently important that it warrants a measurement completely independent of the traditional parallax and standard candle based methods.***

AST-0206010 Schechter，Paul L.在这个项目中，将使用两种不同的策略来搜索光学波长的引力透镜类星体。首先，麦哲伦一号（巴德）望远镜将获得6500个已知类星体的常规（但高度自动化）指向直接图像。第二，直接图像在三个过滤器将获得1000平方度与0.24弧秒像素和亚弧秒分辨率与MPIA 2.2米望远镜。保守估计透镜的数量为32个，超过了过去二十年中通过光学或无线电技术单独发现的系统数量。由于90%的类星体是无线电安静的，这两个搜索将补充最近成功的无线电搜索，并提供足够明亮的系统，以便在光波长进行广泛的后续工作。引力透镜类星体选择星系的依据是质量，而不是光。透镜星系的样本，通常在中等红移，补充中等红移的样本选择的视星等。它们给出的是质量函数而不是光度函数，光度函数是星系演化模型的重要组成部分。透镜类星体也允许测量哈勃常数，宇宙学参数，它设定了宇宙的尺度。 哈勃常数非常重要，它保证了完全独立于传统视差和标准烛光方法的测量。