Optical-NIR spectra of quasars close to reionization (z~ 6)

Details Optical-NIR spectra of quasars close to reionization (z~ 6) Optical-NIR spectra of quasars close to reionization (z~ 6)

2011-01-10

arxiv.org/abs/1101.1948v2

AN, 332, No. 3, 315-318 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Proceedings of the workshop "The first year with X-shooter" October 19-22 2010, Como, Italy. Accepted for publication in Astro

Scientific paper

10.1002/asna.201111545

X-shooter, with its characteristics of resolution, spectral coverage and efficiency, provides a unique opportunity to obtain spectra of the highest-redshift quasars (z ~ 6) that will allow us to carry out successful investigations on key cosmological issues, from the details of the re-ionization process, to the evolution of the first galaxies and AGNs. In this paper, we present the spectra of three z ~ 6 quasars: one obtained during the commissioning of X-shooter and two in the context of our ongoing GTO programme. Combining this sample with data in the literature, we update the value of the C IV cosmic mass density in the range 4.5 < z < 5, confirming the constant trend with redshift between 2.5 and 5.

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