Relativistic Plasma Probes of Low Overdensity Environments

低超密度环境的相对论等离子体探测器

• 批准号: 0607674
• 负责人: Thomas Jones
• 金额: $ 55.88万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-01 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607674&HistoricalAwards=false
• 关键词: Relativistic; Plasma; Probes; Low; Overdensity

AST-0607674JonesA large fraction of baryons in the low-z universe reside in hard-to-observe gaseous low-density settings, which contain crucial information about the evolution of the cosmic web. There is an increasing appreciation that this evolution is heavily influenced by magnetized relativistic particle populations, that is, relativistic plasmas. Synchrotron and non-thermal X-ray emissions from these plasmas also serve as unique observational diagnostics of environmental physical conditions. This project is an ambitious suite of theoretical and observational studies of these relativistic plasmas and their interactions with the surrounding thermal plasmas. It includes: a survey of filaments of galaxies for shocks due to infall, using rotation measure synthesis; measuring the local pressures in regions of low galactic and baryon density using radio galaxies; exploring the intra-group medium through studies of mini-halos of synchrotron radiation; the first 3D simulations of radio galaxy evolution, including magnetic fields and radiant relativistic plasmas, in realistic, inhomogeneous low density cosmological environments; and investigation of emissions from cosmic rays in large scale cosmic structure shocks and in super-wind terminal shocks, including nonlinear feedback on flows and associated MHD turbulence. The combination of unique multidimensional MHD simulations with realistic synthetic observations will identify the optimal physical analysis methods to apply to real observations. The synergy between the observational and theoretical efforts will greatly enhance the value of the insights to be gained from each alone.This research will train undergraduate and graduate students in both cutting edge science and the development of innovative data analysis and numerical simulation techniques. The team has a commitment to spreading their results, including work with the local planetarium, K-12 public schools, and community groups.

AST-0607674JONESA在低Z宇宙中的大部分重子均位于难以观察的气态低密度设置中，这些设置包含有关宇宙网络演化的重要信息。 人们越来越多地认识到，这种进化受磁化相对论粒子种群的影响，即相对论等离子体。 来自这些等离子体的同步加速器和非热X射线排放也是环境物理条件的独特观察诊断。 该项目是这些相对论等离子体的理论和观察性研究及其与周围热等离子体的相互作用的雄心勃勃的套件。 它包括：使用旋转测量合成的旋转测量结果对导致冲击引起的冲击的细丝的调查；使用射电星系测量低银河和重子密度区域的局部压力；通过研究同步辐射的迷你山谷来探索组内培养基；射电星系演化的第一个3D模拟，包括磁场和辐射相对论等离子体，在现实，不均匀的低密度宇宙学环境中；并研究了大规模宇宙结构冲击和超级末端冲击的宇宙射线的排放，包括流量和相关MHD湍流的非线性反馈。 独特的多维MHD模拟与逼真的合成观察的组合将确定适用于实际观察结果的最佳物理分析方法。 观察性和理论努力之间的协同作用将大大提高每个单独的见解的价值。这项研究将培训尖端科学的本科生和研究生，以及创新数据分析和数值模拟技术的发展。 该团队致力于传播其结果，包括与当地天文馆，K-12公立学校和社区团体合作。