Abstract
Diagnostics of the physical properties in the Broad Line Region (BLR) of Active Galactic Nuclei (AGN) is a difficult subject to study since there is no simple and direct method as is a case for the Narrow Line Region. We propose here a direct method for the temperature estimates in the BLR, that is using the broad Balmer and helium lines (He II lambda4686 and He I lambda5876).
