Variability of Active Galactic Nuclei

活动星系核的变异性

• 批准号: 0307912
• 负责人: C. Martin Gaskell
• 金额: $ 43.56万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2008-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307912&HistoricalAwards=false
• 关键词: Variability; Active; Galactic; Nuclei

AST-0307912GaskellThe PI and his extensive set of collaborators will carry out a large-scale, four-year, multi-observatory, international study of the regions surrounding the super-massive black holes in active galactic nuclei, with two main objectives: (1) to understand how to produce the intense radiation seen, especially the X-ray, ultraviolet, and optical emission, and (2) to study the distribution and motions of the dense gas close to the black holes by using its response to variations in the ionizing radiation. Simultaneous ground-based optical continuum observations and space-based X-ray measurements will be the largest study undertaken to address the question of the relationship between these two emissions. Collecting a large homogeneous sample of high signal-to-noise optical spectra to combine with the X-ray and continuum data will permit "reverberation mapping" of the rapidly moving dense gas close to the black hole.Significant effort is devoted to developing international partnerships between the US, Mexico, China, and observatories in the Former Soviet Union (FSU) republics of Armenia, Georgia, Kazakhstan, Russia, Ukraine and Uzbekistan. The wide range of longitudes spanned by the FSU sites fills in the problematic "Asian gap" in previous studies, enhancing the capability to do time series analysis, and permitting studies on shorter timescales than before. The project has heavy student involvement, extending to gifted high school students, with significant participation at the PI's University by under-represented minorities.***

AST-0307912GaskellThe PI and his extensive set of collaborators will carry out a large-scale, four-year, multi-observatory, international study of the regions surrounding the super-massive black holes in active galactic nuclei, with two main objectives: (1) to understand how to produce the intense radiation seen, especially the X-ray, ultraviolet, and optical emission, and (2) to study the distribution and motions of密集的气体通过使用其对电离辐射的变化的响应来接近黑洞。 同时进行的基于地面的光学连续观测和空间X射线测量将是解决这两种排放之间关系问题的最大研究。 收集大量同质的高信噪光谱样本与X射线和连续数据结合，将允许在靠近黑洞的迅速移动的浓密气体的“回响映射”。这很重要的努力致力于在美国，墨西哥，中国和前苏联联盟（FSGIA）中的墨西哥，墨西哥，中国和观察者之间建立国际合作伙伴关系，俄罗斯，乌克兰和乌兹别克斯坦。 在先前的研究中，FSU站点所跨越的纵向范围填补了有问题的“亚洲差距”，增强了进行时间序列分析的能力，并允许对较短的时间表的研究比以前。 该项目的学生参与度很大，扩展到有天赋的高中生，由代表不足的少数民族在PI大学参与。***