Probing the High-Redshift Universe with Quasar Elemental Abundances
نویسنده
چکیده
The heavy elements near QSOs provide unique measures of the star formation and chemical evolution in young galactic nuclei or pre-galactic condensations. Studies of quasar abundances also naturally address a variety of questions regarding the physics of QSO environments, including the Baldwin Effect emphasized at this meeting. Here I review the status of quasar abundance work.
منابع مشابه
ar X iv : a st ro - p h / 03 02 49 4 v 1 2 4 Fe b 20 03 Quasar Elemental Abundances at High Redshifts
We examine rest-frame ultraviolet spectra of 70 high redshift quasars (z ≥ 3.5) to study the chemical enrichment history of the gas closely related to the quasars, and thereby estimate the epoch of first star formation. The fluxes of several ultraviolet emission lines were investigated within the framework of the most recent photoionization models to estimate the metallicity of the gas associat...
متن کاملQuasar Elemental Abundances and Host Galaxy Evolution
High redshift quasars mark the locations where massive galaxies are rapidly being assembled and forming stars. There is growing evidence that quasar environments are metal-rich out to redshifts of at least five. The gas-phase metallicities are typically solar to several times solar, based on independent analyses of quasar broad emission lines and intrinsic narrow absorption lines. These results...
متن کاملELEMENTAL ABUNDANCES IN QUASISTELLAR OBJECTS: Star Formation and Galactic Nuclear Evolution at High Redshifts
■ Abstract Quasar (QSO) elemental abundances provide unique probes of highredshift star formation and galaxy evolution. There is growing evidence from both the emission and intrinsic absorption lines that QSO environments have roughly solar or higher metallicities out to redshifts>4. The range is not well known, but solar to a few times solar metallicity appears to be typical. There is also evi...
متن کاملELEMENTAL ABUNDANCES IN QSOS: Star Formation and Galactic Nuclear Evolution at High Redshifts
Quasar (or QSO) elemental abundances provide unique probes of highredshift star formation and galaxy evolution. There is growing evidence from both the emission and intrinsic absorption lines that QSO environments have roughly solar or higher metallicities out to redshifts >4. The range is not well known, but solar to a few times solar appears to be typical. There is also evidence for higher me...
متن کاملConstraining the Star Formation Histories of Grb Host Galaxies from Their Observed Abundance Patterns
Long-duration Gamma Ray Bursts (GRBs) are linked to the collapse of massive stars and their hosts are exclusively identified as active, star forming galaxies. Four long GRBs observed at high spectral resolution at redshift 1.5 ≤ z ≤ 4 allowed the determination of the elemental abundances for a set of different chemical elements. In this paper, for the first time, by means of detailed chemical e...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998