TitleEvidence for Non-evolving Fe II/Mg II Ratios in Rapidly Accreting z ~ 6 QSOs
AuthorsDe Rosa, G.; Decarli, R.; Walter, F.; Fan, X.; Jiang, L.; Kurk, J.; Pasquali, A.; Rix, H. ...
Bibcode

2011ApJ...739...56D   Search ADS ↗

AbstractQuasars (QSOs) at the highest known redshift (z ~ 6) are unique probes of the early growth of supermassive black holes (BHs). Until now, only the most luminous QSOs have been studied, often one object at a time. Here we present the most extensive consistent analysis to date of 4 < z < 6.5 QSOs with observed near-infrared spectra, combining three new z ~ 6 objects from our ongoing Very Large Telescope-Infrared Spectro ...
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22 Objects    Search NED ↙