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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2009

MOND and the dark baryons

Résumé

We consider for the first time the implications for the modified gravity MOND model of galaxies, of the presence of dark baryons, in 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× 10-10 m s-2, c = 3), which is also compatible with the one obtained from a second method minimizing the scatter in the baryonic Tully-Fisher relation.
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Dates et versions

hal-03733087 , version 1 (22-10-2022)

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Olivier Tiret, Françoise Combes. MOND and the dark baryons. Astronomy and Astrophysics - A&A, 2009, 496, pp.659-668. ⟨10.1051/0004-6361/200811085⟩. ⟨hal-03733087⟩
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