New UBVRI
colour distributions in E-Type galaxies
I. The data «
T.P. Idiart, R. Michard and J.A. de
Freitas Pacheco
ABSTRACT
New colour distributions have been derived from wide field UBVRI frames for 36 northern bright elliptical galaxies and a few lenticulars. The classical linear representations of colours against log r were derived, with some improvements in the coherence of the colour system. The "central colours", integrated within a radius of 3" , and the "outermost colours" averaged near the mV = 24 surface brightness, were also obtained. Some typical deviations of colour profiles from linearity are described. Colour-colour relations of interest are presented.Very tight correlations of interest are found between the U-V colour and the Mg2 line index, measured either at the galaxian center or at the effective radius.