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arXiv 1603.02685astro-ph.GA
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作为引力理论检验的星系旋转下降曲线

Declining rotation curves of galaxies as a test of gravitational theory

Hosein Haghi, Amir E. Bazkiaei, Akram Hasani Zonoozi, Pavel Kroupa

摘要:

与牛顿动力学遵循强等效原理的线性动力学不同,任何非线性引力,如Milgromian动力学(MOND),都违反了强等效原理,系统的引力动力学受到其所处的外部引力场的影响。这种所谓的外场效应(EFE)是MOND的重要含义之一,并为检验Milgromian动力学提供了一个特殊的背景。在这里,我们研究了18个旋涡星系的旋转曲线(RC),发现它们的形状限制EFE。结果表明,EFE通过减小RCs外部的速度,成功地纠正了Milgromian动力学拟合中80%的样本星系的自转速度被高估的问题.我们比较了隐含的外部场与引力场的不可忽略的附近来源的每个星系,并发现在许多情况下,它是兼容的EFE内的不确定性。因此,我们认为,在Milgromian动力学的框架下,人们可以约束的引力场诱导的环境中的星系的RC。最后,我们表明,考虑到EFE产生更现实的值恒星的质量与光比的恒星星族的合成比没有EFE暗示。

英文摘要:

Unlike Newtonian dynamics which is linear and obeys the strong equivalence principle, in any nonlinear gravitation such as Milgromian dynamics (MOND), the strong version of the equivalence principle is violated and the gravitational dynamics of a system is influenced by the external gravitational field in which it is embedded. This so called External Field Effect (EFE) is one of the important implications of MOND and provides a special context to test Milgromian dynamics. Here, we study the rotation curves (RCs) of 18 spiral galaxies and find that their shapes constrain the EFE. We show that the EFE can successfully remedy the overestimation of rotation velocities in 80\% of the sample galaxies in Milgromian dynamics fits by decreasing the velocity in the outer part of the RCs. We compare the implied external field with the gravitational field for non-negligible nearby sources of each individual galaxy and find that in many cases it is compatible with the EFE within the uncertainties. We therefore argue that in the framework of Milgromian dynamics, one can constrain the gravitational field induced from the environment of galaxies using their RCs. We finally show that taking into account the EFE yields more realistic values for the stellar mass-to-light ratio in terms of stellar population synthesis than the ones implied without the EFE.

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