A. Humphrey, L. Binette
We discuss the failure of canonical AGN photoionization models to explain the CII lambda1335 A to CII]lambda2326 A flux ratio in the extended narrow line regions of type 2 radio loud quasars at z∼2.5. We propose kappa-distributed electron energies as a natural solution. Low gas metallicity, shock ionization or continuum fluorescence provide plausible, but less natural, solutions.
Massive Young Star Clusters Near and Far: From the Milky Way to Reionization
Y. D. Mayya, D. Rosa GonzŠlez, E. Terlevich
INAOE & AMC, Page 219