arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1107.2415astro-ph.GA
收藏

用星光偏振法约束银河系磁场模型

Constraining Galactic Magnetic Field Models with Starlight Polarimetry

Michael D. Pavel

摘要:

本文提供了可检验的预测星光偏振约束的几何形状的银河磁场,特别是极向分量的性质。银河发电机模拟和银河尘埃分布的文献相结合的斯托克斯辐射转移模型预测观测到的偏振和近红外星光的位置角,假设光是由对齐的各向异性尘埃颗粒偏振。S0和A0磁场模型和磁桨距角的作用都检查。全天空的预测,并确定特定的方向,为模型之间的区别提供诊断能力。累积分布函数的归一化程度的偏振和图的偏振位置角与银河系纬度的建议作为工具,对观测模型进行测试。

英文摘要:

This paper provides testable predictions about starlight polarizations to constrain the geometry of the Galactic magnetic field, in particular the nature of the poloidal component. Galactic dynamo simulations and Galactic dust distributions from the literature are combined with a Stokes radiative transfer model to predict the observed polarizations and position angles of near-infrared starlight, assuming the light is polarized by aligned anisotropic dust grains. S0 and A0 magnetic field models and the role of magnetic pitch angle are all examined. All-sky predictions are made, and particular directions are identified as providing diagnostic power for discriminating among the models. Cumulative distribution functions of the normalized degree of polarization and plots of polarization position angle vs. Galactic latitude are proposed as tools for testing models against observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑