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2009•The Astrophysical JournalOpen access

THE MORPHOLOGICAL-DEPENDENT TULLY-FISHER RELATION OF SPIRAL GALAXIES

Shiyin Shen, Caihong Wang, Ruixiang Chang, Zhengyi Shao, Jinliang Hou, Chenggang Shu

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Abstract

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 that 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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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 that 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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Available abstract

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 that 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.

Key concepts: Tully–Fisher relation, Bulge, Astrophysics, Spiral galaxy, Physics, Galaxy rotation curve, Luminosity, Spiral (railway)

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