论文标题
磁场对内银河旋转曲线的影响
The effect of magnetic field on the inner Galactic rotation curve
论文作者
论文摘要
在过去的几十年中，一些研究指出，磁场可能会影响星系中的旋转曲线。但是，与暗物质和重型成分的影响相比，影响相对较小。在这封信中，我们重新审视磁场对银河系旋转曲线的影响。我们表明，内部银河旋转曲线可能会受到磁场的显着影响。不需要先前提出的内部凸起组件的添加来说明内部旋转曲线数据。磁场的贡献可以完全解释从银河中心从5 pc到50 pc之间的内部旋转速度的过度。我们的分析还可以将中央常规磁场强度的方位角组件限制为$ b_0 \ sim 50-60 $ $ $ $ $ g，这与观察到的范围一致。
In the past few decades, some studies pointed out that magnetic field might affect the rotation curves in galaxies. However, the impact is relatively small compared with the effects of dark matter and the baryonic components. In this letter, we revisit the impact of magnetic field on the rotation curve of our Galaxy. We show that the inner Galactic rotation curve could be affected significantly by the magnetic field. The addition of the inner bulge component, which has been proposed previously to account for the inner rotation curve data, is not necessary. The magnetic field contribution can fully account for the excess of the inner rotation velocity between 5 pc to 50 pc from the Galactic Centre. Our analysis can also constrain the azimuthal component of the central regular magnetic field strength to $B_0 \sim 50-60$ $μ$G, which is consistent with the observed range.
