Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..267...73n&link_type=abstract
Co-Evolution of Central Black Holes and Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 267
Astronomy and Astrophysics
Astronomy
Early Universe, Galaxies: Active, Galaxies: Evolution, Galaxies: High-Redshift, Galaxies: Nuclei, Galaxies: Seyfert, Quasars: Emission Lines, Quasars: General
Scientific paper
Chemical properties of AGNs and their redshift evolution are of interest to understand the star-formation history of AGN host galaxies and the co-evolution between galaxies and supermassive black holes (SMBHs). One important observational clue on this issue is a tight correlation between the AGN luminosity and the metallicity of the broad-line region. Surprisingly this relation shows no redshift evolution, even up to z ~ 6. This correlation is attributable mainly to the positive correlation between metallicity and SMBH mass, rather than to the relation between metallicity and Eddington ratio. A significant positive correlation between the metallicity and the AGN luminosity is also seen in narrow-line regions, not only in broad-line regions. Possible implications of these results on the galaxy-SMBH co-evolution are briefly mentioned.
Maiolino Roberto
Marconi Alessandro
Matsuoka Kenichi
Nagao Tatsuya
Taniguchi Yoshiaki
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