Magnetic field morphology in interstellar clouds with the velocity gradient technique

Magnetic field morphology in interstellar clouds with the velocity gradient technique
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利用速度梯度技术研究星际云中的磁场形态

DOI:
10.1038/s41550-019-0769-0
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发表时间:
2019
期刊:
影响因子:
14.1
通讯作者:
Lazarian, Alex
Lazarian, Alex
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Hu, Yue;Yuen, Ka Ho;Lazarian, Victor;Ho, Ka Wai;Benjamin, Robert A.;Hill, Alex S.;Lockman, Felix J.;Goldsmith, Paul F.;Lazarian, Alex

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磁场虽然在许多天体物理环境中无处不在,但在观测上是具有挑战性的。基于磁化湍流中涡旋各向异性的特性,速度梯度技术是一种与尘埃偏振相结合的方法,它能够跟踪天空平面磁场,测量星际介质的磁化强度,并利用谱线观测来估计分子云中引力崩塌气体的比例。在这里,我们将这项技术应用于古尔德带的五个低质量恒星形成分子云,并将结果与从极化尘埃发射获得的磁场方向进行比较。我们发现,两种方法的磁场取向和磁化强度的估计在统计上是相似的。我们估计了选定的云团中坍塌气体的比例。利用速度梯度技术,我们还给出了没有尘埃偏振数据的史密斯云的天平磁场方向和磁化强度。
Magnetic fields, while ubiquitous in many astrophysical environments, are challenging to measure observationally. Based on the properties of anisotropy of eddies in magnetized turbulence, the velocity gradient technique is a method synergistic to dust polarimetry that is capable of tracing plane-of-the-sky magnetic fields, measuring the magnetization of interstellar media and estimating the fraction of gravitational collapsing gas in molecular clouds using spectral line observations. Here, we apply this technique to five low-mass star-forming molecular clouds in the Gould Belt and compare the results to the magnetic field orientation obtained from polarized dust emission. We find that the estimates of magnetic field orientations and magnetization for both methods are statistically similar. We estimate the fraction of collapsing gas in the selected clouds. By using the velocity gradient technique, we also present the plane-of-the-sky magnetic field orientation and magnetization of the Smith Cloud, for which dust polarimetry data are unavailable.
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发表时间: 2007-10
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