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arXiv 0704.0740astro-ph
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MOND中盘状星系的垂直动力学

Vertical dynamics of disk galaxies in MOND

Carlo Nipoti, Pasquale Londrillo, HongSheng Zhao, Luca Ciotti

摘要:

通过研究盘星系的垂直动力学,探讨了区分修正牛顿动力学(MOND)和牛顿引力与暗物质的可能性。我们考虑在赤道平面上具有相同圆周速度的模型(MOND中的纯重子盘和嵌入球形暗物质晕中的牛顿引力中的相同盘),并且我们通过在两个积分分布函数的假设下求解Jeans方程来构造它们的内禀和投影运动学场。我们发现,深MOND磁盘的垂直速度色散可以远远大于在等效球牛顿模型。然而,在更现实的情况下,高表面密度盘的这种影响显着减少,铸造怀疑的可能性之间的区别MOND和牛顿引力与暗物质通过使用当前的观测。

英文摘要:

We investigate the possibility of discriminating between Modified Newtonian Dynamics (MOND) and Newtonian gravity with dark matter, by studying the vertical dynamics of disk galaxies. We consider models with the same circular velocity in the equatorial plane (purely baryonic disks in MOND and the same disks in Newtonian gravity embedded in spherical dark matter haloes), and we construct their intrinsic and projected kinematical fields by solving the Jeans equations under the assumption of a two-integral distribution function. We found that the vertical velocity dispersion of deep-MOND disks can be much larger than in the equivalent spherical Newtonian models. However, in the more realistic case of high-surface density disks this effect is significantly reduced, casting doubts on the possibility of discriminating between MOND and Newtonian gravity with dark matter by using current observations.

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