Document Type
Article
Publication Date
1-12-2012
Abstract
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 ΛCDM and of alternative theories like modified Newtonian dynamics (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 M b = AV 4f with A = 47 6 M km -4 s 4. This is equivalent to MOND with a 0 = 1.3 0.3 s -2. The scatter in the data is consistent with being due entirely to observational uncertainties. It is unclear why the physics of galaxy formation in ΛCDM happens to pick out the relation predicted by MOND. We introduce a feedback efficacy parameter to relate halo properties to those of the galaxies they host. correlates with star formation rate and gas fraction in the sense that galaxies that have experienced the least star formation have been most impacted by feedback. © 2012. The American Astronomical Society. All rights reserved.
Keywords
galaxies: dwarf, galaxies: irregular, galaxies: kinematics and dynamics, galaxies: spiral
Publication Title
Astronomical Journal
Grant
908370
Rights
© The American Astronomical Society. All rights reserved. This content is free to access, download, and share. For all other uses, you must obtain permission to reuse content: https://journals.aas.org/article-charges-and-copyright/#AAS_material
Recommended Citation
The Baryonic Tully-Fisher Relation of Gas-Rich Galaxies as a Test of ΛcDM and MOND. Stacy S. McGaugh 2012 AJ 143 40
Manuscript Version
Final Publisher Version