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D. Burgarella, V. Buat (Laboratoire d'Astrophysique de Marseille)
The visibility and the evolution of the morphological parameters of galaxies are studied as a function of the redshift. The main results are: 1) Local spiral galaxies would be hardly observed and classified if projected at high redshifts (z > 1) unless a strong luminosity evolution is assumed. Consequently, the non-detection of large galactic disks cannot be used without caution as a constraint on the evolution of galatic disks. 2) Spiral galaxies observed in ultraviolet appear more irregular since the contribution from the young stellar population becomes predominent. When these galaxies are put in a "log Asymmetry vs.log Concentration" diagram,they move to the irregular sector defined at visible wavelengths. In conclusion, this diagram cannot be used for an efficient classification of morphological ultraviolet types and the analysis of high redshift galaxies cannot be carried out in a reliable way so far. So, in order not to misinterpret the data, it clearly appears that we need to define a new way of classifying the galaxies that would be valid whatever the rest-frame observed wavelength and more specifically at ultraviolet wavelengths.
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