Radiation Transfer in Aligned Grains: Probing Magnetic Fields in Molecular Clouds, Protostars, and Disks

对齐颗粒中的辐射传输：探测分子云、原恒星和圆盘中的磁场

• 批准号: 0507164
• 负责人: Barbara Whitney
• 金额: --
• 依托单位: SPACE SCIENCE INSTITUTE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507164&HistoricalAwards=false
• 关键词: Radiation; Transfer; Aligned; Grains; Probing

AST-0507164INSTITUTION: Space Science InstitutePI: Barbara WhitneyTITLE: Radiation Transfer in Aligned Grains: Probing Magnetic Fields in Molecular Clouds, Protostars, and Disks ABSTRACTDrs. Barbara Whitney (Space Science Institute), Fabian Heitsch (University Observatory, Munich, Germany), Alexandre Lazarian (University of Wisconsin, Madison) and Michael Wolff (Space Science Institute) will undertake a program to provide improved tools for interpreting polarization data in star formation regions. This will be accomplished by combining radiation transfer, magneto-hydrodynamic simulations, and grain alignment theories. Modification of existing codes will be used to calculate emission, extinction, and scattering from aligned grains while simultaneously solving for the temperature of the grains as a function of grain size, in arbitrary 3-D density structures with arbitrary luminosity sources. The codes will provide spectral energy distributions and images, including linear and circular polarization, at any wavelength. Computation of molecular cloud/cloud core density and magnetic field grids, using an MHD code using the latest grain alignment theories, will also be undertaken. The purpose of the program is to test grain alignment theories and probe magnetic structures in disks, protostellar envelopes, and molecular clouds. The tools developed in this research program will be made available to the general astronomical community, providing for a broader impact.

参考文献：空间科学研究所：Barbara WhitneyTITLE：取向颗粒中的辐射传输：探测分子云、原恒星和圆盘中的磁场。Barbara Whitney(空间科学研究所)、Fabian Heitsch(德国慕尼黑大学天文台)、Alexandre Lazarian(威斯康星大学麦迪逊分校)和Michael Wolff(空间科学研究所)将开展一项计划，为解释恒星形成区域的偏振数据提供改进的工具。这将通过结合辐射传输、磁流体力学模拟和颗粒取向理论来实现。对现有程序的修改将用于计算取向颗粒的发射、消光和散射，同时求解具有任意光度源的任意三维密度结构中作为颗粒尺寸函数的颗粒温度。这些代码将提供任何波长下的光谱能量分布和图像，包括线偏振和圆偏振。还将使用采用最新颗粒取向理论的MHD程序计算分子云/云核心密度和磁场网格。该计划的目的是测试颗粒排列理论，并探测圆盘、原恒星包层和分子云中的磁性结构。在这项研究计划中开发的工具将向普通天文学社区提供，提供更广泛的影响。