Application of Accretion Disk Wind Models to QSOs /AGN

吸积盘风模型在QSOs/AGN中的应用

• 批准号: 0071193
• 负责人: Desmond Hillier
• 金额: $ 20.97万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-15 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0071193&HistoricalAwards=false
• 关键词: Application; Accretion; Disk; Wind; Models

AST-0071235Olinto, Angela V.The Origin of the Highest Energy ParticlesThe goal of this project is to conduct theoretical investigations into the origin of the highest energy cosmic rays (UHE cosmic rays, with E 5x 1019 eV). Using plausible scenarios for the production and propagation of these energetic particles (ranging from young neutron star winds to AGNs), Olinto and co workers will study several types of acceleration models and also model the propagation of different types of particles which may make up the UHE cosmic rays. Using these different models, they will generate predictions (of for example energy spectrum and relative isotropy) for comparison with the data obtained by such experiments as the Pierre Auger Project, the High Resolution Fly's Eye, the Japanese Telescope Array, and the OWL-Airwatch experiment.Occasionally a subatomic particle enters the atmosphere with so much energy that it produces a giant cascade of many tens of billions of secondary particles which can be observed by very large detectors on Earth. The particles that produce these giant air showers have been accelerated to far greater energies than can be achieved with terrestrial machines indicating incredibly powerful astronomical accelerators previously unforeseen. The explanation for the origin of these highestenergy particles remains unclear with a number of possibilities being proposed and constrained as the observations accumulate. The possibility that these particles come from the edge of the observable Universe is limited by the presence of the microwave background that fills all of spaceand degrades the energy of such high energy particles. The microwave background limits the location of these fantastic cosmic accelerators to relatively nearby in cosmological terms. The most plausible proposals range from supermassive black holes in centers of nearby galaxies to decaying particles left over from the Big Bang. The goal of this project is to try and find the answer by studying most plausible proposals in detail and model aspects of the propagation from source to Earth. Propagation studies will be intimately related to the knowledge of magnetic fields in the largest scales presently observed and particle physics models of interactions at the highest energies. Among plausible sources, we will investigate many models ranging from the most nearby possibility that these particles are iron accelerated in young neutron stars in the disk of our own Galaxy to the possible effects of large extra-dimensions on the physics of ultra-highenergy cosmic rays. Funding for this project is provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***

AST-0071235 Olinto，Angela V.最高能量粒子的起源该项目的目标是对最高能量宇宙射线（UHE宇宙射线，E 5x 1019 eV）的起源进行理论研究。利用这些高能粒子（从年轻的中子星星风到活动星系核）的产生和传播的合理场景，Olinto及其同事将研究几种类型的加速模型，并对可能构成UHE宇宙射线的不同类型粒子的传播进行建模。使用这些不同的模型，他们将产生预测（例如能谱和相对各向同性），以便与皮埃尔俄歇计划、高分辨率蝇眼、日本望远镜阵列等实验获得的数据进行比较，猫头鹰-偶尔，一个亚原子粒子进入大气层，其能量如此之大，以至于产生了数百亿次级粒子的巨大级联地球上的大型探测器就能观测到 产生这些巨大的空气簇射的粒子已经被加速到比地面机器所能达到的更大的能量，这表明了以前无法预见的令人难以置信的强大天文加速器。对这些高能粒子起源的解释仍然不清楚，随着观测的积累，提出了许多可能性并受到限制。这些粒子来自可观测宇宙边缘的可能性受到微波背景的限制，微波背景充满了所有的空间，并降低了这些高能粒子的能量。微波背景辐射限制了这些奇妙的宇宙加速器的位置，使它们在宇宙学意义上相对较近。最有可能的假设范围从附近星系中心的超大质量黑洞到大爆炸遗留下来的衰变粒子。该项目的目标是通过详细研究最合理的建议并对从源到地球的传播进行建模来试图找到答案。传播研究将与目前观测到的最大尺度的磁场知识和最高能量下相互作用的粒子物理模型密切相关。在可能的来源中，我们将研究许多模型，从最近的可能性，即这些粒子是在我们银河系圆盘中年轻中子星中加速的铁，到大额外维度对超高能宇宙射线物理学的可能影响。 该项目的资金由美国国家科学基金会的河外天文宇宙学计划（AST/EXC）提供。