Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-08-10
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
submitted to ApJL
Scientific paper
The "baryonic" Tully-Fisher relation (BTFR) is an important observational constraint on cosmological and galactic models. However, the observed BTFR only accounts for stars, molecular, and atomic gas, while the contribution of ionized gas is almost universally missed. Comparison of such observations to theoretical predictions is, therefore, highly non-trivial, and requires a proper modeling of radiative transfer of ionizing radiation, at least in an approximate form. An example of such modeling is presented in the form of a cosmological numerical simulation with radiative transfer. The observed BTFR of model galaxies is in reasonable agreement with the observational data, because the contribution of ionized gas progressively increases for smaller and smaller galaxies. Hence, the observed BTFR cannot be used as an argument against the LCDM cosmological model.
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