Holmberg-II超越了MOND理论吗？
Is Holmberg-II beyond MOND theory?
摘要：
我们比较了两个富含气体的矮星系：KK 246和Holmberg II（HoII）的基本性质和运动学。HoII在蓝色波段的亮度是KK 246的20倍，其HI质量是KK 246的6倍。然而，这两个星系的旋转曲线（在最后一个测量点）的振幅非常相似，在7 kpc的银河系中心半径下约为40 km/s。这一事实对于修正的引力理论来说是一个挑战，修正的引力理论预测了任何半径的引力和星系中封闭的重子质量之间的一一关系。特别是，修改后的牛顿动力学（MOND）预测HoII的渐进平坦速度为60 km/s。由于HoII的重子质量主要是由气体成分决定的，所以即使恒星盘的质量可以忽略不计，MOND也会过度提升其旋转速度。我们得出结论，HoII的旋转曲线可能与MOND不一致，除非倾角和距离都被微调到非常不可能的值。
英文摘要：
We compare the basic properties and kinematics of two gas-rich dwarf galaxies: KK246 and Holmberg II (HoII). HoII is 20 times more luminous in the blue-band than KK246 and its HI mass is a factor of 6 higher than in KK246. However, the amplitudes of the rotation curves (at the last measured point) of both galaxies are very similar, of about 40 km/s at a galactocentric radius of 7 kpc. This fact is challenging for modified theories of gravity that predict a one-to-one relation between gravity at any radius and the enclosed baryonic mass in galaxies. In particular, MOdified Newtonian Dynamics (MOND) predicts an asymptotic flat velocity of 60 km/s in HoII. Since the baryonic mass of HoII is dominated by the gas component, MOND overboosts its rotation speed even if the mass of the stellar disk is taken negligibly small. We conclude the rotation curve of HoII is probably inconsistent with MOND, unless the inclination and distance are both fine-tuned to very unlikely values.
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