The prediction of rotation curves in gas-dominated dwarf galaxies with modified dynamics

Abstract

I consider the observed rotation curves of 12 gas-dominated low-surface-brightness galaxies -- objects in which the mass of gas ranges between 2.2 and 27 times the mass of the stellar disk (mean=9.4). This means that, in the usual decomposition of rotation curves into those resulting from various mass components, the mass-to-light ratio of the luminous stellar disk effectively vanishes as an additional adjustable parameter. It is seen that the observed rotation curves reflect the observed structure in gas surface density distribution often in detail. This fact is difficult to comprehend in the context of the dark matter paradigm where the dark halo completely dominates the gravitational potential in the low surface density systems; however it is expected result in the context of modified Newtonian dynamics (MOND) in which the baryonic matter is the only component. With MOND the calculated rotation curves are effectively parameter-free predictions.

9 pages, 4 figures, submitted

References in corpus (5)

• The Radial Acceleration Relation in Rotationally Supported Galaxies
• High-resolution mass models of dwarf galaxies from LITTLE THINGS
• NGC 3741: dark halo profile from the most extended rotation curve
• Energy transfer from baryons to dark matter as a unified solution to small-scale structure issues of the $\Lambda$CDM model
• MOND in galaxy groups

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• Simulations of star forming main sequence galaxies in Milgromian gravity
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• A Toy Model for the Dynamical Discrepancies on Galactic Scales
• Dark matter -- Modified dynamics: Reaction vs. Prediction
• On the Orbital Velocity of Isolated Galaxy Pairs: a test of gravity in the low acceleration regime