SIMBAD references

A grid of models for starburst spectra is presented and compared with power-law models which represent active galactic nuclei (AGNs). The models are composite, i.e., they account for the radiation from the starburst and for the shocks created by superwinds. Some interesting fits of models to observations are also discussed. In particular, it is found that [O III]/Hβ can reach values as high as for the AGN when the emitting clouds are close to the starburst region. Moreover, C IV lines can be high even if Si IV lines are relatively low. It is found that for some line ratios, which have similar values for starburst and AGN models, the width of the lines can allow one to distinguish between the two types.