Galaxy effective radius
= Galaxy effective radius
{wiki=Galaxy_effective_radius}
The effective radius of a galaxy, often denoted as \\( R_e \\) or \\( r_\{\\text\{eff\}\} \\), is a key parameter in astronomy that describes the size of a galaxy in terms of its brightness distribution. Specifically, it is defined as the radius within which half of the total light (or luminosity) of the galaxy is contained.