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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448186.0, MPI für Astronomie / Publikationen_mpia
Near-infrared spectroscopy of SDSS J0303 - 0019: a low-luminosity, High-Eddington-Ratio quasar at z ~ 6
Authors:Kurk, J. D.; Walter, F.; Fan, X.; Jiang, L.; Jester, S.; Rix, H. W.; Riechers, D. A.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:2
Start Page:833
End Page:837
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present sensitive near-infrared (NIR) VLT ISAAC spectroscopic observations of the z = 6.08 quasar SDSS J030331.40-001912.9. This quasi-stellar object (QSO) is more than a magnitude fainter than other QSOs at z ~ 6 for which NIR spectroscopy has been obtained to date and is therefore presumably more representative of the QSO population at the end of cosmic reionization. Combining rest-frame UV continuum luminosity with the width measurements of the Mg II and C IV lines, we derive a black hole mass of 2+1.0 -0.5 × 108 M sun, the lowest mass observed for z ~ 6 QSOs to date, and derive an Eddington ratio of 1.6+0.4 -0.6, among the highest value derived for QSOs at any redshift. The Spitzer 24 mum nondetection of this QSO does not leave space for a significant hot dust component in its optical/NIR spectral energy distribution, in common with one other faint QSO at z = 6, but in contrast to more than 20 more z = 6 QSOs and all known lower redshift QSOs with sufficiently deep multiwavelength photometry. We conclude that we have found evidence for differences in the intrinsic properties of at least one z ~ 6 QSO as compared to the lower redshift population.
Free Keywords:early universe; galaxies: high-redshift; quasars: emission lines; quasars: individual: SDSS J030331.40 -- 001912.9
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009ApJ...702..833K [ID No:1]
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