The dynamics of face-on galaxies in MOND

Conference proceedings article

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Author list: Angus GW

Publisher: IOP Publishing: Conference Series

Place: BRISTOL

Publication year: 2016

Journal: Journal of Physics: Conference Series (1742-6588)

Journal acronym: J PHYS CONF SER

Volume number: 718

Number of pages: 5

eISBN: *****************

ISSN: 1742-6588

eISSN: 1742-6596

Languages: English-Great Britain (EN-GB)

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Abstract

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.

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