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arXiv 1802.09191astro-ph.GAastro-ph.SR
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高银河纬度七个MBM云的偏振

Polarization of seven MBM clouds at high galactic latitude

S. Neha, G. Maheswar, A. Soam, Chang Won Lee

摘要:

我们对MBM 33-39云团方向的234颗恒星进行了R波段偏振测量。使用来自2 MASS调查的偏振结果和近红外光度测定法将MBM 33-39复合物的距离确定为$120\pm10$ pc。从我们的极化结果推断出的单个云的磁场几何形状表明,场线与从之前的研究中获得的该区域的全球磁场几何形状总体上一致。这意味着复合体中的云被星际磁场渗透。对投射在复合体上的几颗恒星进行的多波长偏振测量表明,这些云中尘埃颗粒的大小与银河系正常星际介质中的尘埃颗粒相似。我们研究了MBM 33-39复合体的可能形成方案,结合我们的研究和文献中的极化结果,并通过确定该地区物质的电离,原子和分子(尘埃)成分的分布。

英文摘要:

We made R-band polarization measurements of 234 stars towards the direction of MBM 33-39 cloud complex. The distance of MBM 33-39 complex was determined as $120\pm10$ pc using polarization results and near-infrared photometry from the 2MASS survey. The magnetic field geometry of the individual cloud inferred from our polarimetric results reveals that the field lines are in general consistent with the global magnetic field geometry of the region obtained from the previous studies. This implies that the clouds in the complex are permeated by the interstellar magnetic field. Multi-wavelength polarization measurements of a few stars projected on the complex suggest that the size of the dust grains in these clouds is similar to those found in the normal interstellar medium of the Milky Way. We studied a possible formation scenario of MBM 33-39 complex by combining the polarization results from our study and from the literature and by identifying the distribution of ionized, atomic and molecular (dust) components of material in the region.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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