On the shape of the light profiles of early-type galaxies

Details On the shape of the light profiles of early-type galaxies On the shape of the light profiles of early-type galaxies

1993-09-10

arxiv.org/abs/astro-ph/9309013v1

Mon.Not.Roy.Astron.Soc.265:1013,1993

Astronomy and Astrophysics

Astrophysics

10 pages, postscript file including figures, PADOVA (archived file truncated during email transfer)

Scientific paper

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 $<\re>=0.3$ kpc to $n=16$ for $<\re>=25$ 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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