Papers › On the shape of the light profiles of early-type galaxies
On the shape of the light profiles of early-type galaxies
N. Caon, M. Capaccioli, M. D'Onofrio
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We have obtained the best fit to the light profiles of a luminosity limited sample of elliptical and S0 galaxies with a power law \rn, letting the exponent remain free rather than keeping it fixed at 1/n=1/4 as in the well known \GV formula. The introduction of a free parameter in the fitting formula (ranging from n=0.5 for <>=0.3 kpc to n=16 for <>=25 kpc) is justified by the existence of a good correlation between n and the global galaxian parameters, such as total luminosity and scale-radius. This result seems to be in line with the segregation of properties between the `ordinary' and `bright' families of early-type galaxies, and has consequence for the claimed independence of the shape of galaxy profiles with respect to the Fundamental Plane parameters.
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