Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-27
Astronomy and Astrophysics
Astrophysics
7 pages. Accepted for publication on A&A Main Journal. Paper with full resolution images is available at : http://obswww.uni
Scientific paper
10.1051/0004-6361:20041660
The Baryonic Tully-Fisher relation (BTF) can be substantially improved when considering that the galactic baryonic mass is likely to consist not only from the detected baryons, stars and gas, but also from a dark baryonic component proportional to the HI gas. The BTF relation is optimally improved when the HI mass is multiplied by a factor of about 3, but larger factors up to 11-16 still improve the fit over the original one using only the detected baryons. The strength of this improved relation is quantified with up-to-date statistical tests such as the Akaike Information Criterion or the Bayesian Information Criterion. In particular they allow to show that supposing a variable $M_\star/L$ ratio instead is much less significant. This result reinforces the suggestion made in several recent works that mass within galactic disks must be a multiple of the HI mass, and that galactic disks are substantially, but not necessarily fully, self-gravitating.
Pfenniger Daniel
Revaz Yves
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