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→Creationistic explanation
where L = luminosity, or
where L = luminosity, or
<math>A = k + 4 \ln v</math>
<math>A = k + 4 \times \ln v</math>
The Tully-Fisher relation was empirical, but Hartnett has given it a theoretical basis. Hartnett tested his equation against the observed values of circular velocity of tracer gases in object NGC 3198 as a function of radial distance from the center. He found that this equation fit the observations almost exactly, while a traditional Newtonian equation for radial velocity,
The Tully-Fisher relation was empirical, but Hartnett has given it a theoretical basis. Hartnett tested his equation against the observed values of circular velocity of tracer gases in object NGC 3198 as a function of radial distance from the center. He found that this equation fit the observations almost exactly, while a traditional Newtonian equation for radial velocity,