Dust Polarization Maps from TIGRESS: E/B Power Asymmetry and TE Correlation
Dust Polarization Maps from TIGRESS: E/B Power Asymmetry and TE Correlation
复制标题
来自 TIGRESS 的尘埃偏振图：E/B 功率不对称性和 TE 相关性
DOI：
10.3847/1538-4357/ab29f2
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
R. Flauger
中科院分区：
文献类型：
--
作者：
Chang;Steve K. Choi;R. Flauger
我们给出了第一大组全天合成尘埃极化图，这些图直接来自使用TIGRESS框架的自洽磁流体力学模拟。这个模拟中的湍流主要是由超新星爆炸驱动的，其速率是由反馈环路自我调节的。数值模拟覆盖了湍流的外尺度和惯性范围，具有均匀的高分辨率。模拟中使用的剪切盒与已分解的超新星驱动的湍流相结合，能够捕捉湍流磁场和平均磁场的产生、增长和饱和。我们构建了353 GHz的偏振图，就像在多相、湍流、磁化的星际介质(ISM)模型中的观察者所看到的那样。为了对模拟的ISM状态进行完全采样，我们使用了350个快照(超过6个反馈环路)和9个有代表性的观察者。合成天空显示出普遍的E/B功率不对称()和正TE相关，这与普朗克卫星的观测结果大体一致。然而，和的范围一般低于普朗克测量的范围。我们发现E/B不对称性和TE相关性的大波动取决于观测者的位置，以及由于恒星形成的爆发而引起的ISM性质的时间波动。这些合成地图被公开提供，以提供新颖的微波天空模型。
We present the first large set of all-sky synthetic dust polarization maps derived directly from a self-consistent magnetohydrodynamics simulation using the TIGRESS framework. Turbulence in this simulation is predominantly driven by supernova explosions, with rates that are self-consistently regulated by feedback loops. The simulation covers both the outer scale and inertial range of turbulence with uniformly high resolution. The shearing-box utilized in the simulation, in concert with resolved supernova-driven turbulence, enables the capturing of generation, growth, and saturation of both turbulent and mean magnetic fields. We construct polarization maps at 353 GHz, as seen by observers inside a model of the multiphase, turbulent, magnetized interstellar medium (ISM). To fully sample the simulated ISM state, we use 350 snapshots spanning over (more than six feedback loops) and nine representative observers. The synthetic skies show a prevalent E/B power asymmetry ( ) and positive TE correlation in broad agreement with observations by the Planck satellite. However, the ranges of and are generally lower than those measured by Planck. We find large fluctuations of E/B asymmetry and TE correlation depending on the observer’s position and temporal fluctuations of ISM properties due to bursts of star formation. The synthetic maps are made publicly available to provide novel models of the microwave sky.
影响因子：
4.8
作者：
B. Thorne;J. Dunkley;D. Alonso;S. Naess
通讯作者：
B. Thorne;J. Dunkley;D. Alonso;S. Naess
影响因子：
4.8
作者：
F. Gent;A. Shukurov;G. Sarson;A. Fletcher;M. Mantere
通讯作者：
F. Gent;A. Shukurov;G. Sarson;A. Fletcher;M. Mantere