SIMBAD references

We investigate ``activity'' and ``quiescence'' in galaxies at relatively high redshifts by modelling the line (and continuum) spectra of each object. The models account consistently for photoionization and shocks. We claim that the starburst effective temperature, the flux from an AGN, and the shock velocity are critical to activity. The results confirm that two sample galaxies show intense starburst activity with temperatures reaching T_*=2x10⁵K and shock velocities V_s>250km/s, while for the remaining galaxies in our sample, the models show quiescent star formation with T_*≤7x10⁴K. A Seyfert 2-like AGN is proposed in one galaxy. The O/H relative abundances derived by the detailed modelling of the spectra are nearly solar for all the sample galaxies, in contrast to those obtained by direct methods.