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

References in corpus (2)

• Baryonic Tully-Fisher Relation for Extremely Low Mass Galaxies
• MOND rotation curves of very low mass spiral galaxies

Cited by in corpus (6)

• 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
• Bulge formation in disk galaxies with MOND
• Discussing the first velocity dispersion profile of an ultra-diffuse galaxy in MOND
• The radial acceleration relation and dark baryons in MOND