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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 606514.0, MPI für Astronomie / Publikationen_mpia
Evidence for non-evolving Fe II/Mg II ratios in rapidly accreting z ~ 6 QSOs
Authors:De Rosa, G.; Decarli, R.; Walter, F.; Fan, X.; Jiang, L.; Kurk, J.; Pasquali, A.; Rix, H. W.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:The Astrophysical Journal
Volume:739
Issue / Number:2
Audience:Not Specified
Abstract / Description:Quasars (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 Spectrometer And Array Camera program with nineteen sources from the literature. The new sources extend the existing Sloan Digital Sky Survey (SDSS) sample toward the faint end of the QSO luminosity function. Using a maximum likelihood fitting routine optimized for our spectral decomposition, we estimate the BH mass (M BH), the Eddington ratio (defined as L bol/L Edd), and the Fe II/Mg
Free Keywords:cosmology: observations; galaxies: active; galaxies: formation; galaxies: high-redshift; quasars: emission lines; quasars: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2011ApJ...739...56D
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