Physical properties of emitting plasma near massive black holes: the Broad Line Region

摘要

We apply the Boltzmann-Plot (BP) method to the Balmer lines to estimate the physical properties in the Broad Line Region of Active Galactic Nuclei. We study the Balmer lines of a sample of 90 AGN from Sloan Digital Sky Survey database, as well as the time variability of the BP parameter A of NGC 5548.