A First Attempt to Calibrate the Baryonic Tully-Fisher Relation with Gas Dominated Galaxies

Details A First Attempt to Calibrate the Baryonic Tully-Fisher Relation with Gas Dominated Galaxies A First Attempt to Calibrate the Baryonic Tully-Fisher Relation with Gas Dominated Galaxies

2009-05-27

arxiv.org/abs/0905.4528v3

The Astronomical Journal, Volume 138, Issue 2, pp. 392-401 (2009)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Published in Astronomical Journal. Contains corrected versions of tables 3-5

Scientific paper

10.1088/0004-6256/138/2/392

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 IMF used in such models.

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