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A Study of Quasar Proximity in O VI Absorbers at z=2-3
Andrew J. Fox, Jacqueline Bergeron, Patrick Petitjean
(Abridged) With the goal of investigating the nature of OVI absorbers at high redshifts, we study the effects of proximity to the background quasar. In a sample of sixteen quasars…
Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
Chris J. Willott, Philippe Delorme, Alain Omont +15
The Canada-France High-z Quasar Survey (CFHQS) is an optical survey designed to locate quasars during the epoch of reionization. In this paper we present the discovery of the first…
Where are the missing cosmic metals ?
A. Ferrara, E. Scannapieco, J. Bergeron
The majority of the heavy elements produced by stars 2 billion years after the Big Bang (redshift z~3) are presently undetected at those epochs. We propose a solution to this cosmi…
Highly ionized absorbers at high redshift
Jacqueline Bergeron, Stéphane Herbert-Fort
We investigate the existence of a metal-rich OVI population in 10 high spectral resolution quasar spectra and define observational criteria for this class of absorbers. The low tem…
The sub-DLA toward HE0001-2340: galaxy formation at z=2
P. Richter, C. Ledoux, P. Petitjean +1
We present a detailed analysis of chemical abundances in a sub-damped Ly alpha absorber (sub-DLA) at z=2.187 towards the quasar HE0001-2340 (z_em=2.28) using VLT/UVES data. This su…
Infrared Number Counts of AGN in the GOODS Fields
E. Treister, C. Megan Urry, the GOODS AGN Team
Using the known numbers and evolution of unobscured AGN, and assuming that there is a large number of corresponding obscured AGN -- as expected if AGN unification is correct -- we…