Metallicity Evolution of Active Galactic Nuclei

Details Metallicity Evolution of Active Galactic Nuclei Metallicity Evolution of Active Galactic Nuclei

2006-12-20

arxiv.org/abs/astro-ph/0612570v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, Conference proceedings to appear in "The Central Engine of Active Galactic Nuclei", ed. L. C. Ho and J.-M.

Scientific paper

In this contribution we report our recent investigation of the gas metallicity in active galactic nuclei and its dependence on luminosity and redshift. We compile large spectroscopic datasets of broad-line and narrow-line AGNs, and compare them with the results of our photoionization models. Through the analysis of both the broad and the narrow emission-line regions, we find that: (1) for a given luminosity, there is no redshift dependence of the gas metallicity; (2) for a given redshift, there is a significant correlation between gas metallicity and luminosity; (3) the luminosity-metallicity relation does no show any evolution in the redshift range 2 < z < 4.

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