Iron Emission in z~6 QSOs

Abstract

We have obtained low-resolution near infrared spectra of three QSOs at 5.7 < z < 6.3 using the NICMOS instrument of the Hubble Space Telescope. The spectra cover the rest-frame ultraviolet emission of the objects between lambda_rest ~ 1600A - 2800A. The Fe II emission-line complex at 2500A is clearly detected in two of the objects, and possibly detected in the third. The strength of this complex and the ratio of its integrated flux to that of Mg II lambda 2800 are comparable to values measured for QSOs at lower redshifts, and are consistent with Fe/Mg abundance ratios near or above the solar value. There thus appears to be no evolution of QSO metallicity to z~6. Our results suggest that massive, chemically enriched galaxies formed within 1 Gyr of the Big Bang. If this chemical enrichment was produced by Type Ia supernovae, then the progenitor stars formed at z ~ 20 +/- 10, in agreement with recent estimates based on the cosmic microwave background. These results also support models of an evolutionary link between star formation, the growth of supermassive black holes and nuclear activity.

13 pages, 3 figures, accepted for publication in ApJ Letters

References in corpus (19)

• New Insight on Galaxy Formation and Evolution from Keck Spectroscopy of the Hawaii Deep Fields
• A Unified Model for the Evolution of Galaxies and Quasars
• A Survey of z>5.8 Quasars in the Sloan Digital Sky Survey I: Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6
• An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zw 1
• Reionization of the Universe and the Early Production of Metals
• A Composite HST Spectrum of Quasars
• Elemental Abundances in QSOs: Star Formation and Galactic Nuclear Evolution at High Redshifts
• On the typical timescale for the chemical enrichment from SNeIa in Galaxies
• Constraints on the Early Formation of Field Elliptical Galaxies
• VLT observations of the z=6.28 quasar SDSS 1030+0524
• High Redshift Quasars and Star Formation in the Early Universe
• Chemical evolution in a model for the joint formation of quasars and spheroids
• Formation and evolution of elliptical galaxies and QSO activity
• Proto-Quasars:Physical States and Observable Properties
• A Constraint on the Gravitational Lensing Magnification and Age of the Redshift z=6.28 Quasar SDSS 1030+0524
• Searching for z ~ 6 Objects with the HST Advanced Camera for Surveys: Preliminary Analysis of a Deep Parallel Field
• Elemental Abundances in the Broad Emission Line Region of Quasars at Redshifts larger than 4
• An FeLoBAL Binary Quasar
• Detection of Iron Emission in the z = 5.74 QSO SDSSp J104433.04-012502.2

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