Beyond the sphericity assumption in dynamical HI models

Details Beyond the sphericity assumption in dynamical HI models Beyond the sphericity assumption in dynamical HI models

2004-12-06

arxiv.org/abs/astro-ph/0412122v1

PoS BDMH2004 (2004) 076

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures. To appear in the Proceedings of Science (published by SISSA),Conference "Baryons in Dark Matter Haloes", N

Scientific paper

It is generally agreed that the rotational velocities of spiral galaxies indicate that a lot of matter is unseen. Hitherto, the majority of these mass models are all based on spherical symmetry, although this assumption is obviously not the one that is closest to reality. We present a new method to derive dynamical mass models from HI-data based on an axisymmetric geometry. To validate our method, we started a project with the aim to create such models from a combined sample of late-type Low Surface Brightness galaxies and early-type High Surface Brightness spiral galaxies. The whole sample spans a wide range of bulge-to-disk ratios and will ultimately allow us to investigate the orbital distribution as a function of morphology.

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