Cosmic rays in the galactic environment

银河环境中的宇宙射线

• 批准号: 1008454
• 负责人: Mateusz Ruszkowski
• 金额: $ 39.47万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-15 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1008454&HistoricalAwards=false
• 关键词: Cosmic; rays; galactic; environment

This project is a theoretical and computational effort to understand quantitatively the effects of cosmic rays on the interstellar gas in galaxies. The Principal Investigator and a postdoctoral researcher supported and mentored under this award, along with collaborators, will develop and implement a cosmic-ray physics module for the widely used magnetohydrodynamic (MHD) code FLASH. This module will permit the simulation of anisotropic thermal conduction and viscosity, and a broad array of cosmic ray energy loss, acceleration, and transfer processes; the new module will be tested against the predictions of linear theory. The team will then use the enhanced FLASH code to (1) simulate the formation of, and internal physical conditions in, molecular clouds, using a two-fluid approximation; (2) simulate the effects of cosmic rays on important MHD instabilities known or suspected to be important in galactic disks; (3) model the correlation between radio and far-infrared emission observed in starburst galaxies; (4) model the radio synchrotron emission from galaxy halos; (5) model the diffuse gamma-ray emission from galactic winds; and (6) model the stripping of galactic gas through interactions with the surrounding intergalactic medium. The Principal Investigator will also participate in an extensive list of outreach activities, including creation of a museum exhibit, public lectures, design of planetarium shows, telescope tours, popular writings, and coordination between his academic department and schools.

该项目是一项理论和计算工作，旨在定量了解宇宙射线对星系中星际气体的影响。主要研究者和博士后研究人员支持和指导下，这个奖项，沿着与合作者，将开发和实施一个宇宙射线物理模块的广泛使用的磁流体动力学（MHD）代码FLASH。该模块将允许模拟各向异性热传导和粘性，以及广泛的宇宙射线能量损失，加速和转移过程;新模块将根据线性理论的预测进行测试。然后，研究小组将使用增强的FLASH代码：（1）使用双流体近似法模拟分子云的形成和内部物理条件;（2）模拟宇宙射线对已知或怀疑在星系盘中重要的重要MHD不稳定性的影响;（3）模拟在星暴星系中观察到的无线电和远红外发射之间的相关性;（4）模拟星系晕的射电同步辐射;（5）模拟星系风的弥散伽马射线辐射;（6）模拟星系气体通过与周围星系际介质相互作用而剥离。首席研究员还将参加一系列广泛的外联活动，包括创建博物馆展览、公开讲座、设计天文馆展览、望远镜图尔斯之旅、通俗著作以及他的学术部门和学校之间的协调。