On the Shape of the Light Profiles of Early Type Galaxies - Part Two - the - Diagram

Details On the Shape of the Light Profiles of Early Type Galaxies - Part Two - the - Diagram On the Shape of the Light Profiles of Early Type Galaxies - Part Two - the - Diagram

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.271..523d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 271, NO. 3/DEC1, P. 523, 1994

Astronomy and Astrophysics

Astronomy

63

Scientific paper

We present new evidence against the universality of the de Vaucouleurs r^1/4^ law, considered to be the best empirical formula for fitting the light profiles of elliptical galaxies, through the analysis of the properties of the (D_n_/A_e_)-<μ>_e_ diagram for a volume-limited sample of early-type galaxies that are members of the Virgo and Fornax clusters. The r^1/4^ law turns out to be only a particular case of the more general r^1/4^ law, where the exponent m is found to correlate with the effective radius of the galaxy. We compare our sample of early-type galaxies with that studied by Burstein et al., and find that the observed differences can be explained in terms of procedures and methodologies adopted for measuring the global photometric parameters such as total luminosities, effective radii, effective surface brightnesses and D_n_ diameters.

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