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Distortion of magnetic fields in Barnard 68

机译：Barnard 68中的磁场扭曲

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摘要

The magnetic field structure, kinematical stability, and evolutionary status of the starless dense core Barnard 68 (B68) are revealed based on the near-infrared polarimetric observations of background stars, measuring the dichroically polarized light produced by aligned dust grains in the core. After subtracting unrelated ambient polarization components, the magnetic fields pervading B68 are mapped using 38 stars and axisymmetrically distorted hourglass-like magnetic fields are obtained, although the evidence for the hourglass field is not very strong. On the basis of simple 2D and 3D magnetic field modeling, the magnetic inclination angles on the plane-of-sky and in the line-of-sight direction are determined to be 47 degrees +/- 5 degrees and 20 degrees +/- 10 degrees, respectively. The total magnetic field strength of B68 is obtained to be 26.1 +/- 8.7 mu G. The critical mass of B68, evaluated using both magnetic and thermal/turbulent support, is M-cr = 2.30 +/- 0.20 M-circle dot, which is consistent with the observed core mass of M-core = 2.1 M-circle dot, suggesting a nearly critical state. We found a relatively linear relationship between polarization and extinction up to A(V) similar to 30 mag toward the stars with deepest obscuration. ration. Further theoretical and observational studies are required to explain the dust alignment in cold and dense regions in the core.
机译：基于背景恒星的近红外偏振观测，揭示了无态致密核心Barnard 68（B68）的磁场结构，运动稳定性和进化状态，测量通过芯中的对准粉尘颗粒产生的二色偏振光。在减去不相关的环境偏振分量之后，迁移B68的磁场使用38颗恒星和轴对称扭曲的沙漏状磁场，尽管沙漏场的证据不是很强。在简单的2D和3D磁场建模的基础上，在天空平面和视线方向上的磁倾角角度被确定为47度+/- 5度和20度+/- 10程度分别。 B68的总磁场强度得到26.1 +/-8.7μg。使用磁性和热/湍流支持评估B68的临界质量，是M-CR = 2.30 +/- 0.20 m圆点，这与观察到的M-Core = 2.1 m圈点的核心质量一致，表明近乎临界状态。我们发现极化和灭绝之间的相对线性的关系，高达（V）类似于30毫巴的朝向具有最深遮挡的星星。配给。需要进一步的理论和观察研究来解释核心的冷和致密区域中的灰尘对准。

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