EDP Sciences
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Volume 383, Number 1, February III 2002
Page(s) 30 - 45
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011699

A&A 383, 30-45 (2002)
DOI: 10.1051/0004-6361:20011699

New UBVRI colour distributions in E-type galaxies

I. The data ,
T. P. Idiart1, R. Michard2 and J. A. de Freitas Pacheco3

1  Instituto de Astronomia, Geofisica e Ciências Atmosféricas, Depto. de Astronomia, Universidade de São Paulo, Av. Miguel Stefano, 4200-CEP, 04301-904 S. Paulo, SP-Brazil
    e-mail: thais@iagusp.usp.br
2  Observatoire de Paris, LERMA, 77 Av. Denfert-Rochereau, 75015 Paris, France
    e-mail: Raymond.Michard@obspm.fr
3  Observatoire de la Côte d'Azur, Département Augustin Fresnel, BP 4229, 06304 Nice Cedex 4, France
    e-mail: pacheco@obs-nice.fr

(Received 17 September 2001 / Accepted 7 November 2001)

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 significant measurements was enlarged both towards the galaxy 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.

Key words: galaxies: elliptical and lenticulars, CD -- galaxies: ISM

Offprint request: R. Michard, michard@obspm.fr

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