A census of the expected properties of classical Milky Way dwarfs in Milgromian dynamics

A census of the expected properties of classical Milky Way dwarfs in Milgromian dynamics
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米尔格罗米亚动力学中经典银河系矮星预期特性的普查

DOI:
10.1093/mnras/stu757
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发表时间:
2014
影响因子:
4.8
通讯作者:
Kroupa
Kroupa
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lüghausen;Famaey;Kroupa

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在最近对仙女座卫星星系内部动力学的成功预测的基础上,我们在Milgromian动力学(MOND)框架下重新审视了经典的银河系矮球状卫星Draco,Sculptor,Sextans,Carina和Fornax。我们第一次使用泊松求解器与自适应网格细化(AMR),以同时考虑银河系及其卫星的引力影响。这使我们能够严格模拟Milgromian动力学的重要外场效应(EFE),它可以显着降低有效加速度。我们预测的动态质光比(Mdyn/L)预计将测量的观察者谁假设牛顿动力学是有效的。我们表明,Milgromian动力学预测典型的Mdyn/L为10-50 M Ω/L Ω。最明亮的天炉座和玉夫座的结果与现有的速度色散数据吻合得很好。此外,动力质量的中心幂律斜率与从速度色散测量中观测推断的值非常吻合。正如安格斯已经指出的那样,与通常引用的观测估计相比,六分仪座、船底座和天龙座的结果很低。对于Milgromian动力学在这些天体中的进一步观测测试中幸存下来,因此需要(a)基于速度色散测量的先前观测结果由于例如双星和污染物异常值而高估了动力学质量,(B)由于银河系潮汐场,卫星不处于维里平衡,或者(c)这里使用的特定理论没有正确地描述EFE(例如,EFE在某些其他理论中实际上可以忽略),或者(a)-(c)的组合。
Prompted by the recent successful predictions of the internal dynamics of Andromeda's satellite galaxies, we revisit the classical Milky Way dwarf spheroidal satellites Draco, Sculptor, Sextans, Carina and Fornax in the framework of Milgromian dynamics (MOND). We use for the first time a Poisson solver with adaptive mesh refinement (AMR) in order to account simultaneously for the gravitational influence of the Milky Way and its satellites. This allows us to rigorously model the important external field effect (EFE) of Milgromian dynamics, which can reduce the effective acceleration significantly. We make predictions on the dynamical mass-to-light ratio (Mdyn/L) expected to be measured by an observer who assumes Newtonian dynamics to be valid. We show that Milgromian dynamics predicts typicalMdyn/L≈ 10-50 M⊙/L⊙. The results for the most luminous ones, Fornax and Sculptor, agree well with available velocity dispersion data. Moreover, the central power-law slopes of the dynamical masses agree exceedingly well with values inferred observationally from velocity dispersion measurements. The results for Sextans, Carina and Draco are low compared to usually quoted observational estimates, as already pointed out by Angus. For Milgromian dynamics to survive further observational tests in these objects, one would thus need that either (a) previous observational findings based on velocity dispersion measurements have overestimated the dynamical mass due to, e.g. binaries and contaminant outliers, (b) the satellites are not in virial equilibrium due to the Milky Way tidal field, or (c) the specific theory used here does not describe the EFE correctly (e.g. the EFE could be practically negligible in some other theories), or a combination of (a)–(c).
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