New UBVRI colour distributions in E-type galaxies I.The data

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 accuracy of the zero point colours and of the gradients. The radial range of signicant measurements was enlarged both towards the galaxian center and towards the outskirts of each object. Thus, the "central colours", integrated within a radius of 3", and the "outermost colours" averaged near the mu_V = 24 surface brightness, could also be obtained. Some typical deviations of colour profiles from linearity are described. Colour-colour relations of interest are presented. Very tight correlations are found between the U-V colour and the Mg2 line-index, measured either at the galaxian center or at the effective radius.

34 pages, 10 figures, to appear in A&A journal

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• Gradients of Absorption Line Strengths in Elliptical Galaxies
• Origin of Color Gradients in Elliptical Galaxies
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• Evolution of UV -- NIR Structural Properties of Cluster Galaxies
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• The elliptical galaxies NGC 1052 and NGC 7796: stellar populations and abundance alpha/Fe ratio
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• Expected Coalescence Rate of Double Neutron Stars for Ground Based Interferometers
• The lenticular galaxy NGC3607: stellar population, metallicity and ionised gas
• Stellar population gradients at cosmic noon as a constraint to the evolution of passive galaxies
• The mid-UV population of the nucleus and the bulk of the post-merger NGC 3610