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arXiv 1703.06282gr-qcastro-ph.GA
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比较了暗物质模型、修正的牛顿动力学模型和修正的引力模型对星系自转曲线的解释

Comparing the dark matter models, modified Newtonian dynamics and modified gravity in accounting for the galaxy rotation curves

Xin Li, Li Tang, Hai-Nan Lin

摘要:

我们比较了六个模型(包括重子模型,两个暗物质模型,两个修正的牛顿动力学模型和一个修正的引力模型)对星系自转曲线的解释。对于暗物质模型,我们假设NFW配置文件和核心修改的配置文件的暗晕,分别。对于修正的牛顿动力学模型,我们讨论了具有两种不同插值函数的Milgrom MOND理论,即标准插值函数和简单插值函数。对于修正引力,我们主要讨论Moffat的MSTG理论。我们将这些模型与观测到的9个高表面亮度和9个低表面亮度星系的自转曲线拟合。我们应用贝叶斯信息准则和赤池信息准则来检验每个模型的拟合优度。结果表明,这六种模型都不能很好地拟合所有的星系自转曲线。两个星系可以用重子模型最好地拟合,而不涉及不发光的暗物质。MOND模型可以拟合最多的星系,而MSTG模型只能拟合一个星系。核修正模型能很好地拟合近一半的LSB星系,但不能拟合HSB星系,而NFW模型只能很好地拟合一小部分HSB星系,但不能拟合LSB星系。这可能意味着,过于简化的NFW和核心修改的配置文件不能很好地模拟假设的暗物质晕。

英文摘要:

We compare six models (including the baryonic model, two dark matter models, two modified Newtonian dynamics models and one modified gravity model) in accounting for the galaxy rotation curves. For the dark matter models, we assume NFW profile and core-modified profile for the dark halo, respectively. For the modified Newtonian dynamics models, we discuss Milgrom's MOND theory with two different interpolation functions, i.e. the standard and the simple interpolation functions. As for the modified gravity, we focus on Moffat's MSTG theory. We fit these models to the observed rotation curves of 9 high-surface brightness and 9 low-surface brightness galaxies. We apply the Bayesian Information Criterion and the Akaike Information Criterion to test the goodness-of-fit of each model. It is found that non of the six models can well fit all the galaxy rotation curves. Two galaxies can be best fitted by the baryonic model without involving the nonluminous dark matter. MOND can fit the largest number of galaxies, and only one galaxy can be best fitted by MSTG model. Core-modified model can well fit about one half LSB galaxies but no HSB galaxy, while NFW model can fit only a small fraction of HSB galaxies but no LSB galaxy. This may imply that the oversimplified NFW and Core-modified profiles couldn't well mimic the postulated dark matter halo.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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