Comments on the paper `Unifying Boxy Bulge and Planar Long Bar in the Milky Way' by Martinez-Valpuesta & Gerhard [arXiv:1105.0928]

M. Lopez-Corredoira, A. Cabrera-Lavers, C. Gonzalez-Fernandez, F. Garzon, T. J. Mahoney, J. E. Beckman

Published 2011-06-01Version 1

We comment on the recent paper by Martinez-Valpuesta & Gerhard (arXiv:1105.0928, 2011), who suggest, as an alternative to the bulge + long bar hypothesis in the inner 4 kpc of our Galaxy, a single boxy-bulge structure with a twisted major axis. In principle, we find this proposal acceptable; indeed, from a purely morphological point of view, this is more a question of semantics than science, and possibly all of us are talking about the same thing. However, we think that the particular features of this new proposal of a "single twisted bulge/bar" scenario leaves certain observational facts unexplained, whereas the model of a misaligned bulge + long bar successfully explains them.