The Baryonic Tully-Fisher Relation of Gas Rich Galaxies as a Test of LCDM and MOND

Understand

The Baryonic Tully-Fisher Relation (BTFR) is an empirical relation between baryonic mass and rotation velocity in disk galaxies.

• It provides tests of galaxy formation models in LCDM and of alternative theories like MOND.
• Observations of gas rich galaxies provide a measure of the slope and normalization of the BTFR that is more accurate (if less precise) than that provided by star dominated spirals, as their masses are insensitive to the details of stellar population modeling.
• Recent independent data for such galaxies are consistent with Mb = AVf^4 with A = 47+/-6 Msun (km/s)^-4.