The morphological dependent Tully-Fisher relation of spiral galaxies

Details The morphological dependent Tully-Fisher relation of spiral galaxies The morphological dependent Tully-Fisher relation of spiral galaxies

2009-09-27

arxiv.org/abs/0909.4903v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 3 figures, ApJ accepted

Scientific paper

The Tully-Fisher relation of spiral galaxies shows notable dependence on morphological types, with earlier type spirals having systematically lower luminosity at fixed maximum rotation velocity $V_{max}$. This decrement of luminosity is more significant in shorter wavelengths. By modeling the rotation curve and stellar population of different morphological type spiral galaxies in combination, we find the $V_{max}$ of spiral galaxies is weakly dependent on the morphological type, whereas the difference of the stellar population originating from the bulge disk composition effect mainly account for the morphological type dependence of the Tully-Fisher relation.

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