Milgrom Relation Models for Spiral Galaxies from Two-Dimensional Velocity Maps

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dc.creatorBarnes, Eric I.
dc.creatorKosowsky, Arthur
dc.creatorSellwood, Jerry A.
dc.date2007-01-18
dc.date.accessioned2026-07-07T11:20:59Z
dc.date.available2026-07-07T11:20:59Z
dc.descriptionUsing two-dimensional velocity maps and I-band photometry, we have created mass models of 40 spiral galaxies using the Milgrom relation (the basis of modified Newtonian dynamics, or MOND) to complement previous work. A Bayesian technique is employed to compare several different dark matter halo models to Milgrom and Newtonian models. Pseudo-isothermal dark matter halos provide the best statistical fits to the data in a majority of cases, while the Milgrom relation generally provides good fits as well. We also find that Milgrom models give mass-to-light ratios that roughly correlate with galaxy color, as predicted by stellar population models. A subsample of galaxies in the Hydra cluster follow a tight relation between mass-to-light and color, but one that is significantly different from relations found in previous studies. Ruling out the Milgrom relation with rotational kinematics is difficult due to systematic uncertainties in the observations as well as underlying model assumptions. We discuss in detail two galaxies for which the Milgrom relation appears to fail and find that relaxing the assumption of constant stellar mass-to-light ratio can maintain Milgrom models' viability.
dc.descriptionaccepted for publication in The Astronomical Journal; 17 pages
dc.identifierhttps://arxiv.org/abs/astro-ph/0701535
dc.identifierhttp://arxiv.org/abs/astro-ph/0701535
dc.identifierAstron.J.133:1698-1709,2007
dc.identifierdoi:10.1086/512188
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194135
dc.subjectAstrophysics
dc.titleMilgrom Relation Models for Spiral Galaxies from Two-Dimensional Velocity Maps
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