Journal
ASTRONOMICAL JOURNAL
Volume 138, Issue 2, Pages 392-401Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/138/2/392
Keywords
galaxies: dwarf; galaxies: kinematics and dynamics
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Funding
- NSF [AST 0505956]
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We calibrate the baryonic Tully-Fisher (BTF) relation using a sample of gas-dominated galaxies. These determine the absolute scale of the baryonic mass-rotation speed relation independent of the choice of stellar mass estimator. We find a BTF slope of 3.94 +/- 0.07 (random) +/- 0.08 (systematic) and a zero point of 1.79 +/- 0.26 (random) +/- 0.25 (systematic). We apply this relation to estimate the stellar masses of star-dominated galaxies. This procedure reproduces the trend of mass-to-light ratio with color predicted by population synthesis models. The normalization is also correct, consistent with empirical estimates of the initial mass function used in such models.
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