Does the galaxy NGC1052-DF2 falsify Milgromian dynamics?
Abstract
A great challenge in present-day physics is to understand whether the observed internal dynamics of galaxies is due to dark matter matter or due to a modification of the law of gravity. Recently, van Dokkum et al. reported that the ultra-diffuse dwarf galaxy NGC1052-DF2 lacks dark matter, and they claimed that this would -- paradoxically -- be problematic for modified gravity theories like Milgromian dynamics (MOND). However, NGC1052-DF2 is not isolated, so that a valid prediction of its internal dynamics in MOND cannot be made without properly accounting for the external gravitational fields from neighbouring galaxies. Including this external field effect following Haghi et al. shows that NGC1052-DF2 is consistent with MOND.
Keywords
Cite
@article{arxiv.1903.11612,
title = {Does the galaxy NGC1052-DF2 falsify Milgromian dynamics?},
author = {Pavel Kroupa and Hosein Haghi and Behnam Javanmardi and Akram Hasani Zonoozi and Oliver Mueller and Indranil Banik and Xufen Wu and Hongsheng Zhao and Joerg Dabringhausen},
journal= {arXiv preprint arXiv:1903.11612},
year = {2019}
}
Comments
15 pages, including supplementary information (the external field formulae), published by Nature: https://rdcu.be/6uZn