We investigate the metallicity of the broad line region (BLR) of a sample of 30 quasars in the redshift range 4 6 quasars. The latter result is puzzling, since the minimum enrichment timescale of carbon is about 1 Gyr, i.e. longer than the age of the universe at z~6.
CITATION STYLE
Berdyugina, S. V., Braun, P. A., Fluri, D. M., & Solanki, S. K. (2005). The molecular Zeeman effect and diagnostics of solar and stellar magnetic fields. Astronomy & Astrophysics, 444(3), 947–960. https://doi.org/10.1051/0004-6361:20053806
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