Milky Way dark matter distribution or MOND test from vertical stellar kinematics with Gaia DR3
Abstract
Vertical stellar kinematics+density can be used to trace the dark matter distribution [or the equivalent phantom mass in a Modified Newtonian Dynamics (MOND) scenario] through Jeans equations. In this paper, we want to improve this type of analysis by making use of the recent data of the 6D information from the Gaia-DR3 survey in the anticenter and the Galactic poles to obtain the dynamical mass distribution near plane regions, including extended kinematics over a wide region of 8 kpc22 kpc, kpc. Our conclusions are as follows: (i) the model of the spherical dark matter halos and the MOND model are compatible with the data; (ii) the model of the disky dark matter (with density proportional to the gas density) is excluded; (iii) the total lack of dark matter (there is only visible matter) within Newtonian gravity is compatible with the data; for instance, at solar Galactocentric radius, we obtained M pc for kpc, compatible with the expected value for visible matter alone of 44 M pc, thus allowing zero dark matter. Similarly, for , kpc: , , , M pc, respectively, for kpc, compatible with visible matter alone. Larger error bars in comparison with previous works are not due to worse data or a more awkward technique but to a stricter modeling of the stellar distribution.
Cite
@article{arxiv.2412.09665,
title = {Milky Way dark matter distribution or MOND test from vertical stellar kinematics with Gaia DR3},
author = {Martin Lopez-Corredoira},
journal= {arXiv preprint arXiv:2412.09665},
year = {2024}
}
Comments
21 pages, 15 figures, accepted to be published in ApJ