Structure Flows, AGN and the WHIM

结构流、AGN 和 WHIM

• 批准号: 0908668
• 负责人: Thomas Jones
• 金额: $ 65.39万
• 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: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908668&HistoricalAwards=false
• 关键词: Structure; Flows; AGN; WHIM

Dr. Jones and Dr. Rudnick will conduct a coordinated program of magnetohydrodynamic (MHD) simulations and radio observations to study the Warm-Hot Intergalactic Medium (WHIM). In the early Universe, low-density gas is mixed with dark matter. As over-dense regions collapse to form the filaments of the 'cosmic web', the gas falls supersonically into these filaments, where it is shock-heated and ionized to form the WHIM. Magnetic fields will be amplified in the shocks, and electrons accelerated to relativistic speeds. This team aims to detect the filamentary WHIM by its polarized radio synchrotron radiation. They will concentrate on a redshift z ~ 0.1, just distant enough that the WHIM filaments appear narrow enough to distinguish them from the Galactic foreground, which predominates on angular scales larger than a degree across. The team will use MHD simulations to follow outflows from giant radio galaxies over megaparsec scales as they impinge on the WHIM, including a self-consistent treatment of cosmic ray acceleration and transport. The simulated objects will be compared to observed structures over the whole spectrum from radio to gamma-rays, to test models for the WHIM and the origin of intergalactic magnetic fields.Two graduate students will be trained by participating in the research, along with undergraduate students. The team will visit schools, churches, civic organizations and state parks to share information about basic astronomy as well as their own research.

琼斯博士和鲁德尼克博士将进行磁流体动力学（MHD）模拟和无线电观测的协调计划，以研究温热星系际介质（WHIM）。 在早期宇宙中，低密度气体与暗物质混合。 当过密区域坍缩形成“宇宙网”的细丝时，气体福尔斯以超音速的方式落入这些细丝中，在那里它被冲击加热并电离形成WHIM。磁场将在冲击波中被放大，电子被加速到相对论速度。 这个团队的目标是通过偏振无线电同步辐射来探测无意识的WHIM。 它们将集中在红移z ~ 0.1的地方，刚好足够远，使WHIM细丝看起来足够窄，以将它们与银河系前景区分开来，后者在大于一度的角尺度上占主导地位。 该团队将使用MHD模拟来跟踪巨型射电星系在百万秒差距尺度上的外流，因为它们撞击WHIM，包括宇宙射线加速和运输的自洽处理。 模拟物体将与观测到的从无线电到伽马射线的整个光谱结构进行比较，以测试WHIM和星系际磁场起源的模型。两名研究生将通过参与研究进行培训，沿着本科生。 该团队将访问学校，教堂，民间组织和州立公园，分享有关基础天文学的信息以及他们自己的研究。