银河系是椭圆形的吗

Back to the Galaxy Pub Date : 2008-05-29 DOI:10.1063/1.43938

K. Kuijken, S. Tremaine

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引用次数: 0

摘要

我们发现，如果银河系平面的引力势是椭圆的，则可以解释银河系运动学中的两个显著异常，即太阳附近老恒星的速度椭球轴比的低值和遥远恒星与HI气体之间的视旋转曲线的差异。在最佳拟合模型中，等势曲线的轴比为0.92，与半径大致恒定，平均圆周速度为200 km s−1。

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Is the Milky Way elliptical

We show that two significant anomalies in the kinematics of the Galaxy, viz. the low value of the axis ratio of the velocity ellipsoid of old stars in the solar neighborhood and the difference in apparent rotation curves between distant stars and HI gas, can be explained if the gravitational potential in the Galactic plane is elliptical. In the best‐fit model, the isopotential curves have an axis ratio of 0.92, roughly constant with radius, and the mean circular speed is 200 km s−1.

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Back to the Galaxy

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