The Baryonic Tully-Fisher Relation

  title={The Baryonic Tully-Fisher Relation},
  author={Stacy S. McGaugh and James M. Schombert and G. D. Bothun and W. J. G. de Blok},
  journal={The Astrophysical Journal Letters},
  pages={L99 - L102}
We explore the Tully-Fisher relation over five decades in stellar mass in galaxies with circular velocities ranging over 30 ≲ Vc ≲ 300 km s-1. We find a clear break in the optical Tully-Fisher relation: field galaxies with Vc ≲ 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 Md = M* + Mgas in place of luminosity restores the single linear relation. The Tully-Fisher… 

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