Black Holes vs. Dark Matter

黑洞与暗物质

• 批准号: 0908639
• 负责人: Karl Gebhardt
• 金额: $ 55.51万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908639&HistoricalAwards=false
• 关键词: Black; Holes; vs.; Dark; Matter

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Dr Gebhardt and his team will use a fiber-fed spectrograph at the McDonald 2.7-meter telescope to measure stellar motions in the outer parts of nearby elliptical galaxies. The large fibers will gather diffuse light over a 2-arcminute field of view, which reaches the outskirts of the target galaxy. These observations will be combined with detailed measurements in the central regions with the Hubble Space Telescope and with 10-meter ground-based telescopes using adaptive optics. The measured motions will be compared with both axisymmetric and triaxial orbit-based models, to place limits jointly on the distribution of dark matter and the mass of a central black hole. This team has already shown that these two quantities are difficult to measure independently, and that omitting the dark halo from models of the central galaxy yields too small a mass for the black hole. The team will concentrate on galaxies for which other mass measures, such as those from X-ray-emitting gas, or the motions of planetary nebulae or globular star clusters, are available for comparison. The computationally expensive modeling will be done at the Texas Advanced Computing Center. This award will support postdoctoral scholar Shen, a graduate student, and undergraduate researchers. As part of his NSF CAREER award AST-0349095, Dr Gebhardt built a web page, available both in English and in Spanish, to make his black hole research accessible to the public. He will maintain and develop this website, in association with StarDate magazine and the McDonald Observatory's visitor center.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。格布哈特博士和他的团队将在麦克唐纳2.7米望远镜上使用光纤光谱仪来测量附近椭圆星系外部的恒星运动。 这些大纤维将在2角分的视场内收集漫射光，这些光将到达目标星系的外围。 这些观测将与哈勃空间望远镜和使用自适应光学的10米地面望远镜在中心区域进行的详细测量相结合。 测量的运动将与轴对称和三轴轨道模型进行比较，以共同限制暗物质的分布和中心黑洞的质量。 这个研究小组已经表明，这两个量很难独立测量，而且从中央星系的模型中忽略暗晕，对黑洞来说质量太小了。 该小组将集中研究那些有其他质量测量方法可供比较的星系，如X射线发射气体、行星状星云或球状星星团的运动。 计算成本高昂的建模将在德克萨斯州高级计算中心完成。 该奖项将支持博士后学者沈，研究生和本科研究人员。 作为NSF职业奖AST-0349095的一部分，格布哈特博士建立了一个英文和西班牙文的网页，使公众能够访问他的黑洞研究。 他将与《StarDate》杂志和麦克唐纳天文台游客中心合作维护和开发该网站。