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-0071235olinto，Angela V.该项目最高能量的目标的起源是对最高能量宇宙射线的起源进行理论研究（uhe cosmic rays，含有E 5X 1019 eV）。 Olinto和Co Workers使用合理的场景来生产和传播这些能量颗粒（从年轻的中子星到AGN），将研究几种类型的加速模型，并模拟可能构成UHE宇宙射线的不同类型的颗粒的传播。它们使用这些不同的模型，它们将产生预测（例如能量谱和相对各向同性），以与通过Pierre Auger Project，高分辨率飞行的眼睛，日本望远镜阵列，OWL-AirWatch实验等实验获得的数据进行比较可以通过地球上非常大的探测器观察到。 与陆地机器相比，产生这些巨大空气淋浴的颗粒已经加速到更大的能量，表明以前无法预料的是强大的天文加速器。这些最高能力颗粒的起源的解释尚不清楚，随着观测值的积累，人们提出和约束了许多可能性。这些颗粒来自可观察到的宇宙边缘的可能性受到微波背景的存在的限制，而微波背景填充了所有的间隔，这会降低这种高能量颗粒的能量。微波背景将这些奇妙的宇宙加速器的位置限制在宇宙学方面相对附近。最合理的建议范围从附近星系中心的超质量黑洞到大爆炸剩下的颗粒。该项目的目的是通过详细研究大多数合理的建议以及从源到地球传播的模型方面来尝试找到答案。传播研究将与目前观察到的最大尺度的磁场知识与最高能量的相互作用的粒子物理模型密切相关。在合理的来源中，我们将研究许多模型，从附近的最可能性，即这些颗粒在我们自己星系的磁盘中加速了铁在年轻的中子恒星中，到大量化对超细胞增强宇宙射线物理学的可能影响。 该项目的资金由NSF Argagalactic天文学和宇宙学计划（AST/EXC）提供。***