mass (Dark + Baryonic Matter in the cosmological proportions 9:1). The total masses under considerations are $1.62\times 10^{12} M_\odot$ (Model A) and $0.03\times 10^{12} M_\odot$ (Model B). The galaxies have been followed from their separation from the global expansion of the universe to their collapse to virialized structures, the formation of stars and subsequent nearly passive evolution. They are followed for a long period of time, i.e. 13 Gyr (Model A) and 5 Gyr (Model B). In any case, well beyond the stages of active star formation which occurs within the first 3 to 4 Gyr (see below). The models take into account radiative cooling by several processes, heating by energy feed back from supernova explosions (both Type I and II) and chemical enrichment. All the models conform to the so-called *revised monolithic scheme*, because mergers of substructures have occurred very early in the galaxy life. Some parameters and results of the two models are summarized in Table \[tabcosmo\]. Note that the shape of the resulting galaxies is nearly spherical both in Dark Matter and stars.

  ----------------------------------------- ---------- ---------- --
  Model                                     A          B          
  Cosmological background                   S-CDM      S-CDM      
  Initial redshift                          50         53         
  $\Omega_m$                                1          1          
  $H_0 = 50 \mbox{ } km 