The dynamics of face-on galaxies in MOND

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Angus, Garry W.^1

Department of Physics and Astrophysics, Vrije Universiteit Brussel, Pleinlaan 2, Brussels

1050, Belgium^1

关键词: Cold dark matters;    Dynamical analysis;    Measurements of;    Standard theories;    Stellar evolutions;    The standard model;    Vertical velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/3/032001/pdf
DOI  :  10.1088/1742-6596/718/3/032001

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We present an overview of the dynamical analysis using the DiskMass Survey's measurements of vertical velocity dispersions of nearly face-on galaxy disks in both MOND and the standard model of cosmology. We found that the only, even partly realistic, solution is to have galaxy disks that are twice as thin as current surveys suggest. In the standard theory, with cold dark matter, after improving upon the original analysis we found the typical mass-to-light ratios to be less than 0.1 for almost half the sample. This is unrealistically low compared to the 0.6 found by stellar evolution models. Both these issues would disappear if the stellar vertical velocity dispersions were incorrectly measured and are actually 30% larger.