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Intrinsic luminosities are related to rotation velocities of disk galaxies byTully Fisher (TF) relations. The Baryonic TF (BTF) relation has recently beenexplained with Dark Matter and Newtonian Gravity as well as Modified NewtonianDynamics (MOND). However, recent work has pointed out that the currently usedBTF relation ignores the contribution from hot gas and oversimplifies complexgalaxy-scale physics. In this Letter, we advocate the use of the NeutralHydrogen TF (HITF) relationship, which is free from dust obscuration andstellar evolution effects, as a clean probe of gravity and dynamics in the weakfield regime. We incorporate the physics of hot gas from supernova feedbackwhich drives the porosity of the Interstellar Medium (ISM). A simple model thatincludes supernovae feedback, is generalized to include a parametrizedeffective gravitational force law. We test our model against a catalogue ofgalaxies, spanning the full range of disks from dwarf galaxies to giantspirals, to demonstrate that a Kennicutt-Schmidt (KS) law for star formationand simple Newtonian gravity is adequate for explaining the observed HI scalingrelations. The data rules out MOND-like theories, within the scope of thismodel.

Neutral Hydrogen Tully Fisher Relation: The case for Newtonian Gravity