分子云中Turbulence耗散范围和磁场强度的探测
Probing the Turbulence Dissipation Range and Magnetic Field Strengths in Molecular Clouds
摘要：
研究了M17恒星形成分子云中HCN和HCO+共存分子的湍流速度色散谱随长度尺度的变化。我们发现，所观察到的离子的光谱相对于中性的向下移动很容易解释的双极扩散范围内的离子和中性湍流能量耗散不同的存在。我们使用这些观测来评估这种解耦尺度，并展示如何以一种全新的方式估计嵌入磁场的天空平面分量的强度。
英文摘要：
We study the turbulent velocity dispersion spectra of the coexistent HCN and HCO+ molecular species as a function of length scale in the M17 star-forming molecular cloud. We show that the observed downward shift of the ion's spectrum relative to that of the neutral is readily explained by the existence of an ambipolar diffusion range within which ion and neutral turbulent energies dissipate differently. We use these observations to evaluate this decoupling scale and show how to estimate the strength of the plane-of-the-sky component of the embedded magnetic field in a completely novel way.
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