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arXiv 1012.2934astro-ph.GA
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加拿大银道巡天对银河系磁场的约束

Constraints on the Galactic Magnetic Field from the Canadian Galactic Plane Survey

Kyle Rae, Jo-Anne Brown

摘要:

银河系的磁场对我们银河系的动力学很重要。它被认为在恒星形成中发挥作用,并影响银河系的结构。为了了解银河系磁场最初是如何形成的,或者它是如何演变的,我们必须首先确定它目前的拓扑结构。为此,我们使用加拿大银河平面测量(CGPS)的观测数据来计算银河系圆盘中迄今为止最高的旋转测量源密度(RM)。使用这些数据,我们估计银河系经度的RM零点在外银河系(在那里的RM河外源观察到通过零,平均而言,随着银河系经度的增加)。我们还使用CGPS纬度扩展检查了RM尺度高度。这些参数的值提供了关键的限制,在银河系磁盘的大规模磁场建模。

英文摘要:

The Galactic magnetic field is important in the dynamics of our Galaxy. It is believed to play a role in star formation and influence the structure of the Galaxy. In order to understand how the Galactic magnetic field originally formed or how it is evolving, we must first determine its present topology. To this end, we have used observations from the Canadian Galactic Plane Survey (CGPS) to calculate the highest source density of rotation measures (RM) to date in the disk of the Galaxy. Using these data, we estimate the Galactic longitude of the RM null point in the outer Galaxy (where the RMs of extragalactic sources are observed to pass through zero, on average, with increasing Galactic longitude). We have also examined the RM scale height using the CGPS latitude extension. The values of these parameters offer critical constraints for modeling the large-scale magnetic field in the Galactic disk.

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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