Optical/Ultraviolet Emission From Active Galactic Nuclei

活动星系核的光学/紫外线发射

• 批准号: 9529230
• 负责人: Omer Blaes
• 金额: $ 17.48万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-01 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9529230&HistoricalAwards=false
• 关键词: Optical; Ultraviolet; Emission; Active; Galactic

AST 95-29230 PI: Omer Blaes Optical/Ultraviolet Emission from active Galactic Nuclei The origin of the optical/UV spectrum in Active Galactic Nuclei is not currently understood. X-ray observations suggest that the standard thin accretion disk paradigm be altered in such a way that a substantial fraction of the gravitational energy be transferred and released outside the optically thick portion of the disk, but it is not clear that such a model can explain all the optical/UV observations. The PI will investigate the consequences of two-phase models (disk and overlying hot corona) for the optical and ultraviolet observations, concentrating in particular on the spectrum and polarization that a non-LTE, self-consistent, atmosphere code would produce. The model, which assumes that the disk and corona are locally coupled at each radius, will explore the parameter space defined by the fraction of accretion power dissipated in the corona and the coronal optical depth. The UV/optical response to X-ray variability will also be studied.

AST 95-29230 PI：活性银核的Omer Blaes光学/紫外线发射目前尚不了解活性银河核中光学/紫外线光谱的起源。 X射线观察表明，标准的薄积聚磁盘范式可以改变，以使大量重力能量的大部分被转移并在磁盘的光学较厚部分之外释放，但是尚不清楚这样的模型可以解释所有光学/UV观测值。 PI将研究光学和紫外线观测的两相模型（磁盘和上覆盖的电晕）的后果，尤其集中于非LTE，自符势的大气代码会产生的频谱和极化。该模型假设磁盘和电晕在每个半径处局部耦合，将探索由电晕和冠状光学深度散发的增生功率的分数所定义的参数空间。还将研究对X射线变异性的UV/光学响应。