B. Rocca-Volmerange, and H. Sol (eds)
EAS Publications Series, 1 (2001) 175–178
Identification of Ionizing Processes in Starbursts and AGNs from Nebular Diagnostics
We present the analysis of emission line spectra of AGNs and starbursts with the help of models coupling shocks and photoionization by AGNs and by massive stars. We show how shocks and photoionization by the central source have to coexist in AGNs in order to reproduce the observed emission line ratios. We also show how stellar photoionization models can be reconciled with the values of the [OI]/Hα and [SII]/Hα ratios observed in starbursts, without requiring an additional ionizing source such as shocks.
© EAS, EDP Sciences 2002