MOND and the dark baryons

Abstract

We consider for the first time the implications on the modified gravity MOND model of galaxies, of the presence of dark baryons, under the form of cold molecular gas in galaxy discs. We show that MOND models of rotation curves are still valid and universal, but the critical acceleration a0 separating the Newtonian and MONDian regimes has a lower value. We quantify this modification, as a function of the scale factor c between the total gas of the galaxy and the measured atomic gas. The main analysis concerns 43 resolved rotation curves and allows us to find the best pair (a0 = 0.96 10e-10 m.s-2, c = 3), which is also compatible to the one obtained from a second method by minimizing the scatter in the baryonic Tully-Fisher relation.

11 pages, 8 figures, accepted in A&A

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Cited by in corpus (16)

• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• MOND theory
• A statistical investigation of the mass discrepancy-acceleration relation
• Galactic rotation curves, the baryon-to-dark-halo-mass relation and space-time scale invariance
• The Tully-Fisher and mass-size relations from halo abundance matching
• MOND vs. dark matter in light of historical parallels
• The Faber-Jackson relation and Fundamental Plane from halo abundance matching
• Post-Newtonian constraints on Lorentz-violating gravity theories with a MOND phenomenology
• Bulge formation in disk galaxies with MOND
• The road to MOND--a novel perspective
• Discussing the first velocity dispersion profile of an ultra-diffuse galaxy in MOND
• Mass Discrepancy-Acceleration Relation in Einstein Rings
• The radial acceleration relation and dark baryons in MOND
• Galaxies with Declining Rotation Curves
• The distinguishing factor for gravity models: stellar population synthesis
• Searching for MOND in scalar-tensor theories of gravity