论文标题
在附近的分子云中流出到磁场方向的普查
A Census of Outflow to Magnetic Field Orientations in Nearby Molecular Clouds
论文作者
论文摘要
我们定义了200个Protostellar流出的样品，显示附近分子云中的蓝色和红移CO发射，ophiuchus，Taurus，Perseus和Orion，以研究流出方向与局部相对较大但相对大的磁场方向之间的相关性。在高显着性（P〜1E-4）下，我们排除了相对方向的随机分布，发现偏爱将投影的天空流出轴与磁场方向排列。相对位置角的分布在〜30兆位处的峰值峰值，并且表现出〜50度的广泛分散体。这些结果表明，磁场在调节流出的发射和/或传播方向方面具有动态影响。然而，围绕完美对齐方向的显着分散表明，由于其他物理过程（例如湍流或强烈的恒星动力相互作用）引起的大量测量不确定性和/或高度的内在变化。根据磁场对的方向，预计向磁场对齐方式的流出将导致相关性，具体取决于场的顺序。分析这种效果，我们发现相关性有限，除了相对较小的尺度<0.5 pc。此外，我们训练一个卷积神经网络，以推断出相对于视线的流出角度，并将其应用于我们的流出样本以估计其完整的3D方向。我们发现，3D空间中流出对之间的角度也显示了小规模对齐的证据。
We define a sample of 200 protostellar outflows showing blue and redshifted CO emission in the nearby molecular clouds Ophiuchus, Taurus, Perseus and Orion to investigate the correlation between outflow orientations and local, but relatively large-scale, magnetic field directions traced by Planck 353 GHz dust polarization. At high significance (p~1e-4), we exclude a random distribution of relative orientations and find that there is a preference for alignment of projected plane of sky outflow axes with magnetic field directions. The distribution of relative position angles peaks at ~30deg and exhibits a broad dispersion of ~50deg. These results indicate that magnetic fields have dynamical influence in regulating the launching and/or propagation directions of outflows. However, the significant dispersion around perfect alignment orientation implies that there are large measurement uncertainties and/or a high degree of intrinsic variation caused by other physical processes, such as turbulence or strong stellar dynamical interactions. Outflow to magnetic field alignment is expected to lead to a correlation in the directions of nearby outflow pairs, depending on the degree of order of the field. Analyzing this effect we find limited correlation, except on relatively small scales < 0.5 pc. Furthermore, we train a convolutional neural network to infer the inclination angle of outflows with respect to the line of sight and apply it to our outflow sample to estimate their full 3D orientations. We find that the angles between outflow pairs in 3D space also show evidence of small-scale alignment.
