Beyond Shakura-Sunyaev: First-Principles Physics of Accretion Disks in Active Galactic Nuclei

超越 Shakura-Sunyaev：活动星系核中吸积盘的第一原理物理学

• 批准号: 0307657
• 负责人: Omer Blaes
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2008-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0307657&HistoricalAwards=false
• 关键词: Beyond; Shakura; Sunyaev; First; Principles

AST-0307657BlaesThe mechanism responsible for the prodigious power output of quasars and active galactic nuclei is almost certainly the accretion of plasma onto super-massive black holes, probably in the form of a rotationally supported accretion disk. The standard model of accretion disks has been based on an ad hoc phenomenological prescription for turbulent angular momentum transport and energy dissipation, introduced by Shakura & Sunyaev some thirty years ago.The current research will create local, radiation-magnetohydrodynamical simulations of this accretion flow, for the first time with no ad-hoc assumptions, which should finally lift the long-standing uncertainties in the standard model. The power and sophistication of modern numerical techniques will be used to determine whether there is an achievable thermally stable equilibrium state, how much turbulent stress is present in radiation-pressure-dominated flows, the average vertical distribution in the flow, and the rates of heat and energy transport. The work will also consider compressibility, density inhomogeneities, and the nonlinear development of photon-bubble and magnetoacoustic-wave instabilities.Snapshots of the turbulent state at different locations in the flow will be made available for scientists everywhere, to add other physics or consider additional effects. Some tests will be possible for the first time because the models will be based on physics and not phenomenological prescriptions. Graduate and undergraduate students will be involved in the research. Animations of the simulation results will be effective as part of the investigators' public talks about the interesting complexity of black hole astrophysics, which continues to fascinate.

AST-0307657BLAESTHE机制，负责类星体和活性银河核的巨大功率输出的机制几乎可以肯定是血浆上的积聚在超质量黑洞上，这可能是以旋转支持的积聚磁盘的形式。 积聚磁盘的标准模型基于大约三十年前Shakura＆Sunyaev引入的湍流动量运输和能量耗散的典型现象学处方。当前的研究将创建本地辐射磁性流液动力学模拟，该学吸收的模拟首次不应在不久的是，该模型不应长期提升。 现代数值技术的功率和复杂性将用于确定是否存在可实现的热稳定平衡状态，辐射压力为主的流动中存在多少湍流应力，流量的平均垂直分布以及热量和能量运输速率。 这项工作还将考虑可压缩性，密度不均匀性以及光子泡和磁声波的非线性开发。流量中不同位置的湍流状态的napshots将为各地的科学家提供，以添加其他物理学或考虑其他物理学。 某些测试将首次进行，因为这些模型将基于物理学而不是现象学处方。 研究生和本科生将参与研究。 仿真结果的动画将有效，这是调查人员公开谈论黑洞天体物理学有趣的复杂性的一部分，这种复杂性继续着迷。