Gas density in the broad-line region is proposed as the primary driver of the MgII Baldwin effect, with lower densities producing steeper (more negative) slopes.
Emission-Line versus Continuum Correlations in Active Galactic Nuclei
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abstract
The Baldwin Effect, a negative correlation between emission-line equivalent width and luminosity in active galactic nuclei, is still of interest as a diagnostic of accretion physics nearly thirty years after its discovery. This review examines recent developments in the study of correlations between line and continuum emission in AGNs, as measured both in ensembles and in individual sources.
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Revealing the Physical Driver of the Baldwin Effect: Gas Density in the Broad-Line Region
Gas density in the broad-line region is proposed as the primary driver of the MgII Baldwin effect, with lower densities producing steeper (more negative) slopes.