Freeman Law

Freeman Law

Freeman Law is a statement in astronomy which says that disk galaxies have a constant surface brightness, Σ. It was noticed in 1970 by Ken Freeman.McGaugh et al, " [http://arxiv.org/abs/astro-ph/9505062 Galaxy Selection and Surface Brightness Distribution] " (1995) "Astron.J.", 110 (1995) 573,]

Freeman law can be used with the Tully-Fisher relation to determine the luminosity and therefore distance of an observed galaxy.

However more recently it has become widely accepted that Freeman Law is an effect of selection bias. [Minnesota State University, " [http://odin.physastro.mnsu.edu/~eskridge/astr225/week10.html] "]

References


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