SIMBAD references

We explore the Tully-Fisher relation over five decades in stellar mass in galaxies with circular velocities ranging over 30≲V_c≲300 km.s^–1. We find a clear break in the optical Tully-Fisher relation: field galaxies with V_c≲90 km.s^–1 fall below the relation defined by brighter galaxies. These faint galaxies, however, are very rich in gas; adding in the gas mass and plotting the baryonic disk mass M_d=M_*+M_gas in place of luminosity restores the single linear relation. The Tully-Fisher relation thus appears fundamentally to be a relation between rotation velocity and total baryonic mass of the form M_d∝V⁴_c.