The Relationship between Slope and Luminosity

Abstract

In this study, a sample of galaxies has been adopted. It consists of 112 elliptical galaxies, among them were 56 dwarf elliptical galaxies, which belong to virgo cluster, 37 normal galaxies and 19 bright galaxies. Also, surface brightness profiles fitted for these galaxies with sersic model (r1/n-model). The linear relation between effective surface brightness and logarithm effective radius log re(kpc) have been calculated, and found, the slope for dwarf elliptical galaxies is 1.89, 2.8 for normal elliptical galaxies and 2.8 for bright galaxies. Also, The linear relation between slope for these type from galaxies and average absolute magntude have been calculated, and found . It is found that rms scatter of this relation is 0.2 mag.

Keywords

• relationship
• between
• slope
• luminosity